A305282 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4 or 8 king-move adjacent elements, with upper left element zero.

0, 7, 55, 1763, 41446, 2636906, 214220078, 29751215558, 7368593302345, 2763205267731126

Offset

1,2

Comments

Diagonal of A305288.

Links

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

Example

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

Crossrefs

Cf. A305288.

Sequence in context: A239156 A117993 A055056 * A197228 A009521 A116120

Adjacent sequences: A305279 A305280 A305281 * A305283 A305284 A305285

Keyword

nonn

Author

R. H. Hardin, May 29 2018

Status

approved