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A185557
1/3 the number of nX7 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
0
21, 13256, 2792166, 684657326, 160107914496, 38323943289566, 9079893278572272, 2159859526859795892
OFFSET
1,1
COMMENTS
Column 7 of A185559
EXAMPLE
Some solutions for 4X7 with a(1,1)=0
..0..0..0..1..1..2..2....0..0..0..1..1..2..2....0..0..1..1..2..2..1
..0..1..0..1..0..0..0....0..1..0..2..2..0..2....0..1..0..1..2..2..1
..0..1..0..1..0..2..2....0..1..0..2..1..0..2....0..1..0..1..0..0..2
..0..0..0..2..2..1..1....0..0..0..1..1..2..2....0..0..0..1..1..2..2
CROSSREFS
Sequence in context: A250065 A180769 A220643 * A276513 A167063 A115485
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 31 2011
STATUS
approved