A282962 Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.

0, 0, 38, 3635, 577003, 206993155, 163712015523, 296587454834249, 1244478900421397928, 12226172933184772433991

Offset

1,3

Comments

Diagonal of A282969.

Links

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

Example

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

Crossrefs

Cf. A282969.

Sequence in context: A319519 A221111 A322331 * A229523 A173133 A221354

Adjacent sequences: A282959 A282960 A282961 * A282963 A282964 A282965

Keyword

nonn

Author

R. H. Hardin, Feb 25 2017

Status

approved