A301666 Number of nX5 0..1 arrays with every element equal to 1, 2 or 4 horizontally or vertically adjacent elements, with upper left element zero.

3, 61, 407, 2793, 21224, 146841, 1073621, 7703565, 55506215, 399555430, 2875870497, 20706418377, 149059329261, 1073124611823, 7725565402834, 55617663607353, 400401309675815, 2882556650714509, 20752023117855145

Offset: 1

Author

R. H. Hardin, Mar 25 2018

Keywords

• nonn

Comments

Column 5 of A301669.

Examples

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

Links

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

Crossrefs

Cf. A301669.