A275137 Number of n X n 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,-2) or (0,-1) and new values introduced in order 0..2.

1, 6, 80, 1088, 9744, 165568, 4055152, 147762240, 7887576208, 624224888096, 72861217834416, 12595738987019680, 3224446583629649792, 1224344356792821362688, 689079095818717776787184

Offset: 1

Author

R. H. Hardin, Jul 17 2016

Keywords

• nonn

Comments

Diagonal of A275142.

Examples

			Some solutions for n=5
..0..1..2..0..1. .0..1..2..1..0. .0..1..2..1..0. .0..1..2..1..0
..2..0..1..2..1. .2..0..1..0..1. .2..0..1..2..0. .2..0..1..2..1
..1..2..1..2..0. .1..0..1..2..0. .1..2..1..2..0. .1..2..1..2..0
..0..2..0..1..0. .1..2..0..2..0. .1..2..0..1..0. .0..2..0..1..0
..2..1..2..1..2. .1..0..2..1..2. .0..1..2..1..2. .2..0..2..0..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..19

Crossrefs

Cf. A275142.