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A316731
Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 5, 11, 55, 137, 275, 274113, 2083319, 5055566, 143371955631
OFFSET
1,2
COMMENTS
Diagonal of A316733.
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..1..1..1..0. .0..0..0..0..0. .0..1..1..1..1
..1..1..0..1..0. .0..1..1..1..0. .0..0..0..0..0. .0..1..1..1..1
..1..0..0..0..0. .1..0..1..0..1. .0..0..0..0..0. .0..1..1..1..1
..0..0..0..1..0. .0..1..1..1..0. .0..0..0..0..0. .1..0..1..0..0
..1..0..1..1..0. .0..1..1..1..0. .0..0..0..0..0. .0..1..1..0..1
CROSSREFS
Cf. A316733.
Sequence in context: A251240 A361529 A305041 * A253086 A260624 A067371
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 11 2018
STATUS
approved