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A317430
Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
0, 7, 61, 1140, 67214, 8362442, 2326497716, 1648608723762, 2852287084420935
OFFSET
1,2
COMMENTS
Diagonal of A317436.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..1..1..1..1. .0..0..1..1..0. .0..0..1..1..0
..0..1..1..1..1. .0..0..1..1..0. .1..0..1..0..0. .0..1..1..0..0
..1..1..1..1..1. .0..1..1..0..0. .1..1..0..0..0. .0..0..0..0..0
..1..0..1..0..1. .1..1..1..1..0. .1..1..0..0..1. .1..0..0..0..1
..1..1..0..1..1. .1..0..1..1..1. .0..0..0..1..1. .0..0..1..0..0
CROSSREFS
Cf. A317436.
Sequence in context: A368324 A350157 A048287 * A145507 A254121 A047685
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 27 2018
STATUS
approved