A283685 Number of n X n 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors.

2, 16, 264, 15226, 2530461, 1119189256, 1496646288297, 5725555721739395, 62058786307229208212, 1952915013418224842868823, 176329484983538571638638096503

Offset

1,1

Comments

Diagonal of A283691.

Links

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

Example

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

Crossrefs

Cf. A283691.

Sequence in context: A351918 A326272 A372513 * A197458 A050974 A012188

Adjacent sequences: A283682 A283683 A283684 * A283686 A283687 A283688

Keyword

nonn

Author

R. H. Hardin, Mar 14 2017

Status

approved