A268993 Number of nX6 binary arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

41, 763, 14080, 244397, 4097199, 66954420, 1073436321, 16957258387, 264744926212, 4093941136805, 62806688095479, 957111538353668, 14502245681077257, 218656000387543867, 3282569954305098964

Offset: 1

Author

R. H. Hardin, Feb 17 2016

Keywords

• nonn

Comments

Column 6 of A268995.

Examples

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

Links

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

Crossrefs

Cf. A268995.

Formula

Empirical: a(n) = 42*a(n-1) -665*a(n-2) +5138*a(n-3) -21972*a(n-4) +55274*a(n-5) -83769*a(n-6) +76202*a(n-7) -40273*a(n-8) +11304*a(n-9) -1296*a(n-10) for n>12