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A316877
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
0
1, 4, 37, 452, 18847, 1187727, 180224021, 79732305036, 91692297769706
OFFSET
1,2
COMMENTS
Diagonal of A316883.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..1..1. .0..1..0..1..0. .0..0..1..0..0
..0..0..0..0..0. .0..0..0..1..1. .0..0..0..0..0. .0..1..0..0..0
..1..0..1..0..0. .1..0..0..0..1. .0..0..0..0..0. .0..1..0..1..0
..0..0..0..1..0. .1..0..0..0..1. .1..0..1..0..0. .1..1..1..0..1
..0..0..0..0..1. .0..0..0..0..0. .1..0..1..0..0. .1..1..1..1..1
CROSSREFS
Cf. A316883.
Sequence in context: A070768 A221630 A235135 * A349254 A365778 A277638
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 15 2018
STATUS
approved