A268636 Number of nX5 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.

96, 1944, 29772, 412740, 5419992, 68710116, 849572724, 10310685036, 123340687488, 1458578214948, 17087534233740, 198629587902636, 2293776106412328, 26339884438238244, 300996939426028068

Offset: 1

Author

R. H. Hardin, Feb 09 2016

Keywords

• nonn

Comments

Column 5 of A268639.

Examples

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

Links

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

Crossrefs

Cf. A268639.

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)