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Number of nX3 1..4 arrays containing at least one of each value, and all equal values connected.
0

%I #3 Mar 31 2012 12:35:35

%S 0,504,10560,103800,671448,3348840,14014320,51729072,173858832,

%T 543596760,1605266976,4526990088,12293408616

%N Number of nX3 1..4 arrays containing at least one of each value, and all equal values connected.

%e Some solutions for n=3

%e ...1.1.1...3.1.1...2.2.3...3.4.1...1.4.2...1.1.1...1.1.2...2.2.3...1.2.4

%e ...2.4.1...1.1.4...1.2.3...3.4.1...1.2.2...1.1.2...4.1.1...1.4.3...1.1.1

%e ...3.4.4...2.4.4...4.2.3...3.2.1...3.3.2...4.3.2...1.1.3...1.3.3...1.3.1

%e ------

%e ...3.3.3...1.2.2...2.1.1...3.3.1...4.4.4...4.4.4...3.3.2...2.3.3...3.3.3

%e ...4.4.1...1.2.4...4.1.1...1.1.1...2.2.1...3.2.4...3.4.2...2.2.1...4.4.1

%e ...2.1.1...3.3.4...3.3.3...4.2.2...2.3.1...3.2.1...3.4.1...4.2.2...4.2.1

%K nonn

%O 1,2

%A _R. H. Hardin_ Oct 21 2009