A268625 Number of n X 5 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totaling two no more than once.

144, 2430, 34890, 467190, 6000978, 74914554, 915847266, 11018667294, 130903914954, 1539375100362, 17950677440298, 207850445630478, 2392281464029314, 27392205838123482, 312238767991217778

Offset: 1

Author

R. H. Hardin, Feb 09 2016

Keywords

• nonn

Comments

Column 5 of A268628.

Examples

			Some solutions for n=3
..2..1..0..0..1. .1..0..0..0..0. .2..1..0..1..2. .2..2..1..0..1
..2..2..1..0..0. .2..1..0..0..0. .1..2..1..2..2. .2..1..2..1..0
..0..1..2..1..0. .2..0..0..0..0. .0..1..2..1..1. .1..0..2..2..1
		

Links

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

Crossrefs

Cf. A268628.

Formula

Empirical: a(n) = 32*a(n-1) -386*a(n-2) +2264*a(n-3) -7265*a(n-4) +13512*a(n-5) -14960*a(n-6) +9872*a(n-7) -3776*a(n-8) +768*a(n-9) -64*a(n-10).