A303311 Number of nX5 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.

8, 7, 24, 50, 139, 349, 853, 2180, 5525, 13824, 34900, 88161, 221923, 559409, 1411020, 3556271, 8964218, 22600998, 56974213, 143622769, 362071261, 912756908, 2300972077, 5800604608, 14622927344, 36863258801, 92929626827, 234268970653

Offset: 1

Author

R. H. Hardin, Apr 21 2018

Keywords

• nonn

Comments

Column 5 of A303314.

Examples

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

Links

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

Crossrefs

Cf. A303314.

Formula

Empirical: a(n) = a(n-1) +9*a(n-3) +2*a(n-4) +4*a(n-5) -10*a(n-6) -6*a(n-7) +4*a(n-9) for n>12