A268992 Number of nX5 binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

23, 278, 3331, 37987, 421450, 4583103, 49084071, 519385102, 5442503771, 56571775611, 584048456162, 5994862809815, 61225907059807, 622579765715526, 6306473266306611, 63664757730483923, 640753995659371194

Offset: 1

Author

R. H. Hardin, Feb 17 2016

Keywords

• nonn

Comments

Column 5 of A268995.

Examples

			Some solutions for n=4
..0..1..0..0..1. .0..1..0..0..0. .0..1..0..1..1. .0..1..0..0..0
..0..1..0..0..1. .0..0..0..0..1. .0..1..0..0..0. .0..0..1..0..0
..1..0..1..0..0. .1..0..0..0..1. .0..0..1..0..0. .1..0..1..1..0
..1..0..1..0..1. .0..1..0..0..0. .0..0..1..0..0. .0..0..0..0..1
		

Links

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

Crossrefs

Cf. A268995.

Formula

Empirical: a(n) = 26*a(n-1) -241*a(n-2) +994*a(n-3) -2060*a(n-4) +2218*a(n-5) -1201*a(n-6) +290*a(n-7) -25*a(n-8) for n>9