A274797 Number of n X n 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) (0,-1) or (-1,0) and new values introduced in order 0..2.

1, 3, 30, 596, 22988, 1774372, 273764292, 85071335388, 53278240463204, 67444355089828632, 172664716787589924632, 895256317336401964070392, 9404595196718819502562934668, 200324135427294084369446897344852

Offset: 1

Author

R. H. Hardin, Jul 07 2016

Keywords

• nonn

Comments

Diagonal of A274803.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15

Crossrefs

Cf. A274803.