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A230530
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Number of nX3 0..6 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 7, and upper left element zero
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1
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0, 0, 0, 0, 52, 1738, 18106, 197916, 2076832, 21111192, 210584430, 2084545432, 20498628052, 200742823012, 1960821313548, 19120799484034, 186245617331536, 1812799632396874, 17636246250640738, 171524349058534882
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OFFSET
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1,5
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 64 (see link above)
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EXAMPLE
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Some solutions for n=7
..0..1..2....0..1..0....0..6..5....0..6..5....0..6..5....0..6..3....0..3..4
..6..4..3....1..2..3....1..2..4....1..1..4....1..0..6....1..5..4....1..2..5
..5..5..6....0..5..4....0..3..2....2..2..3....2..4..5....2..1..3....0..1..6
..4..1..0....6..6..5....6..4..5....3..1..2....3..2..4....3..0..2....6..0..0
..3..2..6....5..0..6....5..5..6....4..3..1....4..5..3....4..5..1....5..6..1
..1..4..5....4..1..5....4..3..0....5..6..0....3..6..2....3..6..0....2..5..2
..2..3..4....3..2..1....1..2..1....4..5..6....2..0..1....4..5..4....3..4..3
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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