A269041 Number of 7Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

0, 25272, 357756, 8277072, 159397596, 3266423688, 63310818360, 1232016734502, 23480085224460, 445037745455958, 8347562556153996, 155656709783860410, 2883687582601214532, 53163977044543395168, 975616567564729165860

Offset: 1

Author

R. H. Hardin, Feb 18 2016

Keywords

• nonn

Comments

Row 7 of A269035.

Examples

			Some solutions for n=2
..0..0. .1..2. .2..2. .0..0. .1..2. .1..0. .1..0. .1..2. .1..0. .2..2
..1..1. .1..2. .2..1. .1..0. .2..2. .0..2. .1..0. .1..0. .1..0. .2..1
..2..2. .1..0. .0..1. .1..2. .2..1. .1..0. .0..0. .1..2. .2..2. .0..1
..2..1. .0..1. .0..0. .2..0. .0..2. .1..2. .1..2. .2..2. .2..2. .2..1
..2..2. .0..1. .0..0. .1..2. .2..1. .1..0. .1..0. .1..0. .2..1. .1..2
..2..1. .0..1. .1..0. .2..2. .2..2. .1..2. .0..0. .1..2. .2..2. .1..0
..2..1. .0..1. .2..2. .2..1. .2..2. .1..0. .0..1. .2..2. .2..2. .0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 92

Crossrefs

Cf. A269035.

Formula

Empirical recurrence of order 92 (see link above)