A269282 Number of 7Xn 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

0, 27634932, 23230366488, 16128206816904, 10181956012212600, 6090616046325570480, 3516906597130333936872, 1980763969657041721006344, 1095070756128723603201412440, 596778595867621855341816843744

Offset

1,2

Comments

Row 7 of A269276.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=2
..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0
..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0
..0..1. .0..3. .0..1. .2..0. .0..2. .0..2. .2..1. .0..1. .2..2. .2..0
..3..3. .1..0. .1..0. .3..2. .3..1. .3..0. .1..1. .3..1. .2..3. .1..0
..0..1. .1..1. .1..0. .0..0. .0..1. .1..1. .1..0. .3..0. .2..3. .3..2
..1..0. .3..1. .2..1. .0..1. .2..0. .1..0. .1..3. .2..2. .3..0. .2..0
..1..3. .1..0. .3..1. .0..0. .0..1. .2..3. .1..3. .3..2. .2..2. .1..3

Crossrefs

Cf. A269276.

Sequence in context: A202571 A274367 A258688 * A018187 A275612 A275613

Adjacent sequences: A269279 A269280 A269281 * A269283 A269284 A269285

Keyword

nonn

Author

R. H. Hardin, Feb 21 2016

Status

approved