A316635 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 7, 43, 524, 14568, 684269, 69857903, 14106315869, 5489873419154

Offset

1,2

Comments

Diagonal of A316641.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=5
..0..1..0..0..1. .0..0..0..0..1. .0..0..0..0..0. .0..1..1..1..1
..1..1..1..0..0. .1..1..0..0..0. .1..0..1..0..1. .1..1..1..0..0
..1..1..1..1..1. .0..1..1..0..0. .0..0..0..0..0. .1..1..0..1..0
..0..1..1..1..0. .1..1..1..1..0. .1..0..0..0..1. .1..0..0..1..1
..0..0..1..1..1. .0..1..0..1..0. .1..1..0..1..1. .1..1..0..1..0

Crossrefs

Cf. A316641.

Sequence in context: A345075 A204733 A195230 * A222981 A023316 A289737

Adjacent sequences: A316632 A316633 A316634 * A316636 A316637 A316638

Keyword

nonn

Author

R. H. Hardin, Jul 09 2018

Status

approved