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A268767
Number of n X n 0..2 arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.
1
0, 12, 112, 2296, 64112, 3104544, 255353744, 36091542548, 8990276037592, 3911658481295924, 3022669494445395808, 4128305052223833006600, 10045914708457218016317000, 43496963453603913793217952196
OFFSET
1,2
COMMENTS
Diagonal of A268774.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..0. .1..2..2..2. .2..2..2..2. .0..1..0..0. .1..0..0..0
..0..0..1..0. .1..2..2..2. .2..2..2..2. .1..0..0..0. .0..0..1..0
..0..0..0..0. .2..2..2..2. .2..2..2..1. .0..0..0..0. .1..0..0..0
..0..1..0..0. .2..1..2..2. .2..2..2..1. .1..0..1..0. .1..0..0..1
CROSSREFS
Cf. A268774.
Sequence in context: A089700 A366716 A290742 * A221368 A083767 A285154
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 13 2016
STATUS
approved