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1/3 the number of nX5 0..2 arrays with no element equal both to the element above and to the element to its left
1

%I #7 Mar 31 2012 12:36:01

%S 81,12288,1841856,275895264,41325395328,6189975781728,927173138866560,

%T 138877768818516672,20801977386689522208,3115849763962378244064,

%U 466711388591033629230624,69906939275393719770229056

%N 1/3 the number of nX5 0..2 arrays with no element equal both to the element above and to the element to its left

%C Column 5 of A184694

%H R. H. Hardin, <a href="/A184690/b184690.txt">Table of n, a(n) for n = 1..200</a>

%F Empirical: a(n)=171*a(n-1)-3370*a(n-2)+29805*a(n-3)-149108*a(n-4)+447784*a(n-5)-778496*a(n-6)+649216*a(n-7)-114688*a(n-8)

%e Some solutions for 3X5 with a(1,1)=0

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 20 2011