A274744 Number of n X n 0..2 arrays with no element equal to any value at offset (-1,-2), (0,-1) or (-1,0) and new values introduced in order 0..2.

1, 3, 34, 813, 40242, 4190533, 920432562, 427529873959, 420708712370442, 878018029249193808, 3889681900917706414509, 36599212212994279601355491, 731787586726658710118188021426

Offset: 1

Author

R. H. Hardin, Jul 04 2016

Keywords

• nonn

Comments

Diagonal of A274749.

Examples

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

Crossrefs

Cf. A274749.