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

1,1

Comments

Column 5 of A268628.

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
..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

Crossrefs

Cf. A268628.

Sequence in context: A250084 A280025 A223687 * A121344 A232819 A185745

Adjacent sequences: A268622 A268623 A268624 * A268626 A268627 A268628

Keyword

nonn

Author

R. H. Hardin, Feb 09 2016

Status

approved