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, 80, 13904, 7002040, 12637025328, 88082672552208, 2456638851763181776, 279573979783982763379528, 131383670545605944288719844352, 256961574793195204388371517319842144

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: A118493 A265846 A381292 * A187052 A159377 A183582

Adjacent sequences: A269142 A269143 A269144 * A269146 A269147 A269148

Keyword

nonn

Author

R. H. Hardin, Feb 20 2016

Status

approved