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A316170
Number of nXn 0..1 arrays with every element unequal to 1, 2, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
0
0, 3, 16, 72, 3087, 139293, 12236682, 4139589568, 4957413596069
OFFSET
1,2
COMMENTS
Diagonal of A316176.
EXAMPLE
Some solutions for n=5
..0..1..0..0..0. .0..1..1..0..1. .0..0..0..1..1. .0..0..0..1..0
..0..0..0..0..1. .1..0..1..1..1. .1..0..0..0..0. .1..0..0..0..0
..0..0..0..0..0. .1..1..1..1..1. .1..0..0..0..0. .0..1..0..0..0
..1..0..0..1..0. .0..1..1..0..1. .0..0..0..1..1. .0..0..0..0..1
..0..0..0..1..0. .1..1..1..0..1. .0..1..0..0..0. .0..1..0..0..0
CROSSREFS
Cf. A316176.
Sequence in context: A015524 A012279 A037098 * A038602 A221829 A004303
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 25 2018
STATUS
approved