A317260 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 10, 74, 718, 7477, 219131, 13595141, 1430955986, 323294486785

Offset

1,2

Comments

Diagonal of A317266.

Links

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

Example

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

Crossrefs

Cf. A317266.

Sequence in context: A356820 A358491 A316305 * A111992 A325583 A344194

Adjacent sequences: A317257 A317258 A317259 * A317261 A317262 A317263

Keyword

nonn

Author

R. H. Hardin, Jul 25 2018

Status

approved