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A268767 Number of nXn 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A268774.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

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: A016152 A089700 A290742 * A221368 A083767 A285154

Adjacent sequences:  A268764 A268765 A268766 * A268768 A268769 A268770

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 2016

STATUS

approved

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Last modified March 24 11:34 EDT 2019. Contains 321448 sequences. (Running on oeis4.)