A282830 Number of n X n 0..1 arrays with no 1 equal to more than one of its king-move neighbors, with the exception of exactly two elements.

0, 0, 18, 2376, 215304, 54433534, 25269280218, 24624747479598, 51072100338656682, 225782061018211065440

Offset

1,3

Comments

Diagonal of A282838.

Links

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

Example

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

Crossrefs

Cf. A282838.

Sequence in context: A279296 A327266 A299696 * A174637 A267065 A356204

Adjacent sequences: A282827 A282828 A282829 * A282831 A282832 A282833

Keyword

nonn

Author

R. H. Hardin, Feb 22 2017

Status

approved