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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.
1
144, 2430, 34890, 467190, 6000978, 74914554, 915847266, 11018667294, 130903914954, 1539375100362, 17950677440298, 207850445630478, 2392281464029314, 27392205838123482, 312238767991217778
OFFSET
1,1
COMMENTS
Column 5 of A268628.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 09 2016
STATUS
approved