A283408 Number of n X n 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors.

2, 16, 416, 39268, 12806920, 14511646624, 57400505786420, 789746010243688796, 37838366365836075668464, 6312472862913407007488479500, 3666528350801224509187871292147488

Offset

1,1

Comments

Diagonal of A283415.

Links

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

Example

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

Crossrefs

Cf. A283415.

Sequence in context: A283851 A130276 A027871 * A343428 A282309 A009397

Adjacent sequences: A283405 A283406 A283407 * A283409 A283410 A283411

Keyword

nonn

Author

R. H. Hardin, Mar 07 2017

Status

approved