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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

%I #6 May 17 2023 12:08:37

%S 144,2430,34890,467190,6000978,74914554,915847266,11018667294,

%T 130903914954,1539375100362,17950677440298,207850445630478,

%U 2392281464029314,27392205838123482,312238767991217778

%N Number of n X 5 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totaling two no more than once.

%C Column 5 of A268628.

%H R. H. Hardin, <a href="/A268625/b268625.txt">Table of n, a(n) for n = 1..210</a>

%F 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).

%e Some solutions for n=3

%e ..2..1..0..0..1. .1..0..0..0..0. .2..1..0..1..2. .2..2..1..0..1

%e ..2..2..1..0..0. .2..1..0..0..0. .1..2..1..2..2. .2..1..2..1..0

%e ..0..1..2..1..0. .2..0..0..0..0. .0..1..2..1..1. .1..0..2..2..1

%Y Cf. A268628.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 09 2016

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Last modified April 19 07:11 EDT 2024. Contains 371782 sequences. (Running on oeis4.)