A269046 Number of n X n 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

3, 42, 594, 24192, 1643376, 242861616, 71430596250, 43961616939276, 56121206116838532, 149312689805356303800, 836315757545942679945480, 9777884421682321788379713444, 242268002268280142077867206348378

Offset

1,1

Comments

Diagonal of A269052.

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

Some solutions for n=4
..2..0..1..2. .1..2..1..2. .0..2..1..0. .2..2..2..2. .0..2..1..2
..1..2..1..0. .1..2..1..0. .1..0..1..0. .1..1..2..2. .1..0..1..2
..1..2..1..0. .1..0..1..0. .0..0..0..0. .2..2..2..1. .0..0..1..0
..1..0..1..0. .1..2..0..0. .0..0..0..1. .1..2..2..2. .0..0..1..0

Crossrefs

Cf. A269052.

Sequence in context: A173936 A219619 A097068 * A092470 A355796 A336572

Adjacent sequences: A269043 A269044 A269045 * A269047 A269048 A269049

Keyword

nonn

Author

R. H. Hardin, Feb 18 2016

Status

approved