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

Author

R. H. Hardin, Feb 20 2016

Keywords

• nonn

Comments

Diagonal of A269186.

Examples

			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.