A275177 Number of n X n 0..2 arrays with no element equal to any value at offset (-2,-1), (-1,0) or (-1,1) and new values introduced in order 0..2.

1, 4, 25, 141, 1465, 23313, 561044, 20397794, 1120217646, 93298660085, 11806084302586, 2272026396983803, 664988521276834246

Offset: 1

Author

R. H. Hardin, Jul 19 2016

Keywords

• nonn

Comments

Diagonal of A275183.

Examples

			Some solutions for n=4
..0..0..1..2. .0..0..0..1. .0..0..0..1. .0..0..0..1. .0..0..0..1
..2..2..0..1. .2..2..2..0. .1..2..2..0. .1..2..2..0. .1..2..2..0
..0..1..2..2. .0..1..1..2. .0..1..1..2. .0..1..1..1. .0..1..1..2
..2..0..0..1. .2..0..0..1. .2..0..0..1. .2..0..0..0. .2..2..0..0
		

Crossrefs

Cf. A275183.