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

1,1

Comments

Column 5 of A268639.

Links

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

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)

Example

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

Crossrefs

Cf. A268639.

Sequence in context: A001667 A093984 A159711 * A233153 A204624 A090449

Adjacent sequences: A268633 A268634 A268635 * A268637 A268638 A268639

Keyword

nonn

Author

R. H. Hardin, Feb 09 2016

Status

approved