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A269145 Number of n X n 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three exactly once. 0
0, 80, 13904, 7002040, 12637025328, 88082672552208, 2456638851763181776, 279573979783982763379528, 131383670545605944288719844352, 256961574793195204388371517319842144 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A269152.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..2..2..2. .1..1..1. .3..3..2. .1..1..0. .0..2..3. .2..2..3. .2..2..1

..3..3..1. .3..3..1. .3..3..2. .1..0..1. .2..3..1. .3..1..1. .2..0..1

..1..1..1. .3..3..2. .3..3..1. .2..0..0. .3..2..0. .1..3..3. .2..0..0

CROSSREFS

Cf. A269152.

Sequence in context: A091754 A118493 A265846 * A187052 A159377 A183582

Adjacent sequences:  A269142 A269143 A269144 * A269146 A269147 A269148

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2016

STATUS

approved

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Last modified October 2 01:30 EDT 2022. Contains 357191 sequences. (Running on oeis4.)