A269179 Number of n X n 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three exactly once.

0, 48, 5888, 2097552, 2563440512, 11426543880704, 192247800095048896, 12445275374147703433760, 3138050414883209885285902752, 3107560086436286975829696986907248

Offset

1,2

Comments

Diagonal of A269186.

Links

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

Example

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

Crossrefs

Cf. A269186.

Sequence in context: A265666 A114721 A057868 * A276098 A233242 A266045

Adjacent sequences: A269176 A269177 A269178 * A269180 A269181 A269182

Keyword

nonn

Author

R. H. Hardin, Feb 20 2016

Status

approved