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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.
1
3, 42, 594, 24192, 1643376, 242861616, 71430596250, 43961616939276, 56121206116838532, 149312689805356303800, 836315757545942679945480, 9777884421682321788379713444, 242268002268280142077867206348378
OFFSET
1,1
COMMENTS
Diagonal of A269052.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 18 2016
STATUS
approved