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A316572
Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 11, 246, 3180, 129257, 8469438, 730909482, 185758559665, 50251974557654
OFFSET
1,2
COMMENTS
Diagonal of A316576.
EXAMPLE
Some solutions for n=5
..0..1..0..0..1. .0..1..0..1..0. .0..0..1..0..1. .0..0..1..1..0
..1..1..1..1..0. .1..0..1..1..0. .1..1..1..1..0. .1..1..0..0..1
..0..1..1..1..1. .0..0..0..1..1. .0..1..1..1..1. .1..1..0..0..0
..0..1..1..1..0. .1..1..0..0..1. .0..1..1..1..0. .1..1..0..0..1
..0..1..0..0..1. .0..0..0..1..0. .1..0..1..0..1. .0..0..1..1..0
CROSSREFS
Cf. A316576.
Sequence in context: A118197 A092658 A304888 * A216571 A299046 A113314
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 07 2018
STATUS
approved