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, 3, 15, 20, 642, 10850, 58615, 6782306, 484120209, 15199851129

Offset

1,2

Comments

Diagonal of A316757.

Links

Table of n, a(n) for n=1..10.

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

Adjacent sequences: A316748 A316749 A316750 * A316752 A316753 A316754

Keyword

nonn

Author

R. H. Hardin, Jul 12 2018

Status

approved