A282521 Number of n X n 0..1 arrays with no 1 equal to more than two of its king-move neighbors.

2, 15, 206, 10041, 1207312, 398640091, 361721564040, 875346670745937, 5767525160678662991, 102661002619385216856135, 4940138347214734739677499008, 643409155783450143737358154350996

Offset

1,1

Comments

Diagonal of A282528.

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
..0..1..1..1. .0..1..0..0. .1..0..1..1. .0..1..0..0. .1..1..1..0
..0..0..0..0. .0..1..0..1. .1..0..0..0. .0..0..1..0. .0..0..0..1
..0..0..1..1. .0..0..0..1. .0..0..1..1. .0..1..0..0. .0..0..1..0
..0..0..1..0. .1..0..1..0. .1..0..1..0. .0..1..0..1. .1..0..0..0

Crossrefs

Cf. A282528.

Sequence in context: A351501 A124558 A020565 * A099718 A143881 A298692

Adjacent sequences: A282518 A282519 A282520 * A282522 A282523 A282524

Keyword

nonn

Author

R. H. Hardin, Feb 17 2017

Status

approved