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A269287 Number of nX6 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once. 1

%I

%S 2592,1363572,544118148,193446959076,64538382287988,20680187784811380,

%T 6444304707617709156,1967513283560471350788,591384314583314302090068,

%U 175574678705837994574453140,51607712999525045688100012356

%N Number of nX6 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once.

%C Column 6 of A269289.

%H R. H. Hardin, <a href="/A269287/b269287.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 564*a(n-1) -87462*a(n-2) +2257724*a(n-3) -21169617*a(n-4) +76236552*a(n-5) -92236816*a(n-6) for n>7

%e Some solutions for n=2

%e ..0..0..2..3..1..0. .0..0..0..3..3..2. .0..0..0..0..1..0. .0..0..1..2..0..1

%e ..2..2..3..1..1..1. .1..0..2..2..0..0. .1..2..2..0..2..2. .1..1..3..1..3..2

%Y Cf. A269289.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 21 2016

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Last modified September 26 06:16 EDT 2021. Contains 347664 sequences. (Running on oeis4.)