A300371 Number of nX7 0..1 arrays with every element equal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 6, 16, 39, 270, 1592, 12042, 75739, 490425, 3084820, 19634393, 129519588, 829432020, 5341866361, 34667291397, 223006749453, 1438573920539, 9290258941352, 59927615962595, 386783857393798, 2495707675837699

Offset: 1

Author

R. H. Hardin, Mar 04 2018

Keywords

• nonn

Comments

Column 7 of A300372.

Examples

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

Links

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

Crossrefs

Cf. A300372.