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A316751
Number of nXn 0..1 arrays with every element unequal to 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 20, 642, 10850, 58615, 6782306, 484120209, 15199851129
OFFSET
1,2
COMMENTS
Diagonal of A316757.
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..1..1..0..1. .0..1..1..1..1. .0..1..0..1..0
..0..1..0..0..1. .0..1..1..0..1. .0..1..1..0..1. .1..0..0..0..1
..0..0..0..0..0. .1..1..1..1..1. .1..1..1..1..1. .0..0..0..0..0
..1..0..0..1..0. .1..0..1..1..0. .1..1..1..1..1. .0..1..0..0..1
..1..0..0..0..1. .0..1..1..1..0. .0..0..1..0..0. .0..0..0..1..0
CROSSREFS
Cf. A316757.
Sequence in context: A224872 A097571 A048087 * A001897 A074214 A036897
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 12 2018
STATUS
approved