A283275 Number of n X n 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors.

2, 15, 287, 18320, 3455416, 1974531630, 3418770498783, 17870966063289283, 282553643923249045737, 13505171096689643652228930, 1951495960309987636340762968396

Offset

1,1

Comments

Diagonal of A283282.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A283282.

Sequence in context: A377895 A371673 A087526 * A372312 A264703 A262961

Adjacent sequences: A283272 A283273 A283274 * A283276 A283277 A283278

Keyword

nonn

Author

R. H. Hardin, Mar 04 2017

Status

approved