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A317377
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 18, 123, 2089, 75405, 4726521, 569899203, 132364711390, 58207830722829, 48518983884550645, 77042834793060609587
OFFSET
1,2
COMMENTS
Diagonal of A317383.
EXAMPLE
Some solutions for n=5
..0..1..0..0..0. .0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0
..0..0..0..0..1. .1..0..0..0..0. .0..0..0..0..0. .0..0..1..1..0
..1..0..0..0..0. .0..0..0..0..0. .0..0..1..0..0. .0..0..0..0..0
..0..0..0..0..0. .0..0..0..0..0. .1..0..0..1..0. .0..0..0..0..0
..0..1..0..0..0. .0..0..1..0..0. .0..0..0..0..1. .0..0..0..0..0
CROSSREFS
Cf. A317383.
Sequence in context: A346680 A292500 A228065 * A332748 A215691 A359460
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 26 2018
STATUS
approved