A275145 Number of 5Xn 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.

41, 1296, 2000, 5248, 9744, 32384, 107472, 362176, 1220752, 4108688, 13848016, 46763600, 158042960, 534108640, 1804746272, 6098041456, 20605419360, 69627945984, 235280517632, 795033992240, 2686484835680, 9077858469008

Offset: 1

Author

R. H. Hardin, Jul 17 2016

Keywords

• nonn

Comments

Row 5 of A275142.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A275142.

Formula

Empirical: a(n) = 8*a(n-1) -27*a(n-2) +56*a(n-3) -75*a(n-4) +61*a(n-5) -28*a(n-6) +7*a(n-7) -a(n-8) for n>12