A269208 Number of n X n 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.

0, 96, 18048, 12548544, 30541426560, 292321215814512, 11273191243423937904, 1787171501783334054571344, 1177416215650225851496983234096, 3247635013385894059877839733594599296

Offset: 1

Author

R. H. Hardin, Feb 20 2016

Keywords

• nonn

Comments

Diagonal of A269214.

Examples

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

Crossrefs

Cf. A269214.