A303312 Number of nX6 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

13, 13, 67, 128, 410, 1221, 3453, 10223, 30247, 88071, 257997, 758575, 2222443, 6510901, 19099863, 56003627, 164158635, 481322825, 1411283805, 4137560893, 12130815503, 35567022201, 104278542849, 305732562651, 896380484697

Offset: 1

Author

R. H. Hardin, Apr 21 2018

Keywords

• nonn

Comments

Column 6 of A303314.

Examples

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

Links

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

Crossrefs

Cf. A303314.

Formula

Empirical: a(n) = a(n-1) +2*a(n-2) +10*a(n-3) +6*a(n-4) -5*a(n-5) -15*a(n-6) -8*a(n-7) -4*a(n-8) for n>11