A268883 Number of nX5 binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.

10, 158, 2190, 27130, 317966, 3596174, 39670270, 429588382, 4585939726, 48401059362, 506108414670, 5251396681678, 54134020936742, 554930619106590, 5661171443312270, 57509255942550986, 582036972222995470

Offset: 1

Author

R. H. Hardin, Feb 15 2016

Keywords

• nonn

Comments

Column 5 of A268886.

Examples

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

Links

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

Crossrefs

Cf. A268886.

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