A300645 Number of nX7 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 41, 340, 9738, 268615, 7455411, 209156119, 5850560104, 164070075524, 4598093771759, 128918622840447, 3614049889811873, 101322289968443168, 2840562813679842551, 79635815085572716192, 2232600346263905624578

Offset: 1

Author

R. H. Hardin, Mar 10 2018

Keywords

• nonn

Comments

Column 7 of A300646.

Examples

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

Links

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

Crossrefs

Cf. A300646.