A269269 Number of n X n 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

0, 108, 46872, 74853576, 542973139128, 19356924219624936, 3516906597130333936872, 3322606082327701612506093240, 16524782213263820847479975782463640

Offset

1,2

Comments

Diagonal of A269276.

Links

R. H. Hardin, Table of n, a(n) for n = 1..11

Example

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

Crossrefs

Cf. A269276.

Sequence in context: A216592 A202634 A270255 * A230474 A030248 A033535

Adjacent sequences: A269266 A269267 A269268 * A269270 A269271 A269272

Keyword

nonn

Author

R. H. Hardin, Feb 21 2016

Status

approved