NAME
Number of nXn n X n 0..2 symmetric matrices with every element equal to zero, one or three horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order
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Revision History for A210901
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Number of n X n 0..2 symmetric matrices with every element equal to zero, one or three horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order
(history; published version)
(history; published version)
AUTHOR
_R. H. Hardin (rhhardin(AT)att.net) _ Mar 29 2012
STATUS
editing
approved
NAME
allocated for Ron HardinNumber of nXn 0..2 symmetric matrices with every element equal to zero, one or three horizontal and vertical neighbors, and new values 0..2 introduced in lower triangle row major order
DATA
1, 2, 20, 464, 22564, 2472584, 603871080, 327862785884, 395850912855384, 1063574508841830552, 6358546221961060404292, 84578736940287879637237736
OFFSET
1,2
EXAMPLE
Some solutions for n=4
..0..1..2..1....0..1..2..1....0..1..2..2....0..1..0..1....0..1..0..2
..1..0..2..0....1..0..1..0....1..0..1..0....1..0..2..1....1..0..1..0
..2..2..0..1....2..1..0..2....2..1..0..2....0..2..1..0....0..1..2..0
..1..0..1..2....1..0..2..1....2..0..2..0....1..1..0..1....2..0..0..1
KEYWORD
allocated
nonn
AUTHOR
R. H. Hardin (rhhardin(AT)att.net) Mar 29 2012
STATUS
approved
editing
NAME
allocated for Ron Hardin
KEYWORD
allocated
STATUS
approved