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A166762
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Number of nX3 1..3 arrays containing at least one of each value, and all equal values connected.
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0
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6, 174, 1548, 8100, 32208, 108456, 327042, 912330, 2403570, 6063738, 14792208, 35140296, 81722988, 186803940, 420988854, 937659294, 2067934782, 4522786278, 9821642100, 21198358092, 45510675048, 97254168192, 206980215882
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| Empirical: a(n)=11*a(n-1)-53*a(n-2)+147*a(n-3)-259*a(n-4)+301*a(n-5)-231*a(n-6)+113*a(n-7)-32*a(n-8)+4*a(n-9)
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EXAMPLE
| Some solutions for n=4
...2.2.2...2.2.3...1.1.1...1.1.2...1.2.2...1.1.1...2.2.3...2.3.3...3.3.3
...1.1.2...3.2.3...3.1.1...2.2.2...3.3.2...1.3.3...2.3.3...2.3.1...3.1.1
...3.1.2...3.3.3...2.2.1...3.2.2...3.3.2...1.1.1...1.1.3...2.3.1...2.1.2
...3.1.1...3.1.3...1.1.1...3.3.3...2.2.2...2.2.1...1.1.1...2.1.1...2.2.2
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...1.1.2...2.2.2...1.1.1...1.1.1...3.3.3...3.3.3...2.2.2...3.3.1...2.1.3
...1.1.1...1.1.3...1.1.1...2.1.1...3.3.1...1.3.3...3.2.1...2.3.1...1.1.3
...1.3.3...3.3.3...2.3.1...2.1.3...2.3.3...1.1.3...3.3.1...2.3.3...1.1.1
...1.1.3...3.3.3...2.3.1...1.1.3...2.2.2...1.2.2...1.1.1...2.3.3...1.1.1
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CROSSREFS
| Sequence in context: A003720 A002884 A198176 * A055165 A071095 A134632
Adjacent sequences: A166759 A166760 A166761 * A166763 A166764 A166765
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net) Oct 21 2009
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