A274889 Number of n X n 0..2 arrays with no element equal to any value at offset (0,-1), (-1,-1) or (-2,0) and new values introduced in order 0..2.

1, 4, 16, 104, 913, 12217, 237807, 6843349, 292253909, 18485204565, 1735778832010, 242007116498916, 50034244634072936, 15365321608796091811

Offset: 1

Author

R. H. Hardin, Jul 10 2016

Keywords

• nonn

Comments

Diagonal of A274895.

Examples

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

Crossrefs

Cf. A274895.