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, 3, 16, 72, 3087, 139293, 12236682, 4139589568, 4957413596069

Offset

1,2

Comments

Diagonal of A316176.

Links

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

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

Adjacent sequences: A316167 A316168 A316169 * A316171 A316172 A316173

Keyword

nonn

Author

R. H. Hardin, Jun 25 2018

Status

approved