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| A358709
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a(n) is the number of free, tree-like polyiamonds, of size 3*n+1, with 120-degree rotational symmetry formed of a central triangle and identical, non-intersecting snakes leading from each of its sides.
(history;
published version)
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#31 by Joerg Arndt at Sat Jan 14 08:15:03 EST 2023
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#30 by Michael S. Branicky at Sat Jan 14 08:00:51 EST 2023
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#29 by Michael S. Branicky at Sat Jan 14 08:00:49 EST 2023
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| KEYWORD
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nonn,more,new
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| STATUS
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approved
editing
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#28 by N. J. A. Sloane at Wed Jan 11 13:13:39 EST 2023
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#27 by Jon E. Schoenfield at Tue Jan 10 23:23:51 EST 2023
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#26 by Jon E. Schoenfield at Tue Jan 10 23:23:49 EST 2023
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| NAME
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a(n) is the number of free, tree-like polyiamonds, of size 3*n+1, with 120 -degree rotational symmetry formed of a central triangle and identical, non-intersecting snakes leading from each of its sides.
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| STATUS
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proposed
editing
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#25 by John Mason at Tue Jan 10 12:27:13 EST 2023
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#24 by John Mason at Tue Jan 10 12:26:52 EST 2023
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| LINKS
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John Mason, <a href="/A358709/a358709.pdf">Illustrations</a>
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#23 by John Mason at Tue Jan 10 12:16:35 EST 2023
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| NAME
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allocateda(n) is the number of free, tree-like polyiamonds, of size 3*n+1, with 120 degree rotational symmetry formed of a central triangle and identical, non-intersecting snakes leading from each forof Johnits Masonsides.
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| DATA
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1, 1, 1, 2, 3, 6, 11, 20, 37, 66, 119, 217, 391, 706, 1274, 2289, 4133, 7435, 13384, 24068
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| OFFSET
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0,4
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| KEYWORD
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allocated
nonn
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| AUTHOR
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John Mason, Jan 10 2023
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| STATUS
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approved
editing
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#22 by John Mason at Tue Jan 10 12:16:35 EST 2023
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| NAME
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allocated for John Mason
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| KEYWORD
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recycled
allocated
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