A269001 Number of 7Xn binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

128, 3272, 91491, 2144780, 49084071, 1073436321, 22995344760, 483176766982, 10012943674291, 205190835537996, 4165999185526245, 83946395869892249, 1680542804576091072, 33458893826064355756, 662949906600663076935

Offset: 1

Author

R. H. Hardin, Feb 17 2016

Keywords

• nonn

Comments

Row 7 of A268995.

Examples

			Some solutions for n=3
..0..1..1. .1..0..0. .0..0..1. .1..1..0. .0..0..1. .1..1..0. .0..1..0
..0..0..1. .0..1..0. .1..0..1. .0..0..1. .1..0..1. .0..0..0. .0..0..1
..1..0..0. .0..1..1. .0..0..0. .0..0..0. .0..0..0. .1..0..0. .1..0..1
..0..0..1. .0..0..0. .1..0..1. .1..0..1. .0..0..1. .0..1..0. .1..0..0
..1..0..1. .0..0..1. .0..0..1. .1..0..0. .0..1..0. .0..0..0. .0..0..0
..0..0..0. .0..0..1. .0..0..0. .1..0..1. .0..1..0. .0..1..0. .1..0..0
..0..0..1. .1..0..0. .0..1..0. .1..0..0. .0..0..0. .0..0..1. .1..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 68

Crossrefs

Cf. A268995.

Formula

Empirical recurrence of order 68 (see link above)