A302386 Number of 7Xn 0..1 arrays with every element equal to 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 1172, 97160, 5421003, 404225195, 29810775827, 2195619257236, 161767569162389, 11926561967149057, 879261959837334277, 64822173992483793756, 4778918571861830147396, 352319630303338775663571

Offset: 1

Author

R. H. Hardin, Apr 06 2018

Keywords

• nonn

Comments

Row 7 of A302381.

Examples

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

Links

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

Crossrefs

Cf. A302381.