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A268625 Number of nX5 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once. 1
144, 2430, 34890, 467190, 6000978, 74914554, 915847266, 11018667294, 130903914954, 1539375100362, 17950677440298, 207850445630478, 2392281464029314, 27392205838123482, 312238767991217778 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)