A301540 Number of nX7 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.

21, 86, 374, 1841, 9037, 47791, 255406, 1432328, 8145489, 46701775, 269741883, 1568279203, 9153838956, 53577605791, 314145731065, 1844204380914, 10835966335712, 63710021424647, 374740321237045, 2204822119962792

Offset: 1

Author

R. H. Hardin, Mar 23 2018

Keywords

• nonn

Comments

Column 7 of A301541.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..156

Crossrefs

Cf. A301541.