A301607 Number of nX7 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

1, 21, 55, 755, 6393, 60841, 591585, 5880829, 58383932, 585233819, 5854941545, 58759934077, 589360075403, 5914609427757, 59355963113549, 595731234612875, 5979121155775603, 60011713256358774, 602331412174313879

Offset: 1

Author

R. H. Hardin, Mar 24 2018

Keywords

• nonn

Comments

Column 7 of A301608.

Examples

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

Links

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

Crossrefs

Cf. A301608.