A269046 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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