A302677 Number of nX5 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

8, 7, 18, 30, 63, 125, 257, 528, 1085, 2228, 4576, 9401, 19311, 39665, 81476, 167363, 343782, 706162, 1450533, 2979557, 6120333, 12571820, 25823881, 53045060, 108960300, 223816249, 459742831, 944361613, 1939821080, 3984602671

Offset: 1

Author

R. H. Hardin, Apr 11 2018

Keywords

• nonn

Comments

Column 5 of A302680.

Examples

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

Links

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

Crossrefs

Cf. A302680.

Formula

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