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Search: id:A166796
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| A166796 |
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Number of nX2 1..3 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in nondecreasing order. |
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+0
1
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| 0, 6, 26, 69, 146, 270, 456, 721, 1084, 1566, 2190, 2981, 3966, 5174, 6636, 8385, 10456, 12886, 15714, 18981, 22730, 27006, 31856, 37329, 43476, 50350, 58006, 66501, 75894, 86246, 97620, 110081, 123696, 138534, 154666, 172165, 191106, 211566, 233624
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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R. H. Hardin, Table of n, a(n) for n=1..83
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FORMULA
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Empirical: a(n)=(n^4+8*n^3+11*n^2-32*n+12)/12
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EXAMPLE
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All solutions for n=3
...1.2...1.2...1.2...1.2...1.2...1.2...1.2...1.2...1.2...1.2...1.2...1.1...1.1
...2.2...2.2...2.2...1.2...1.2...1.2...1.3...1.3...3.2...3.2...3.3...2.2...2.2
...2.3...3.2...3.3...1.3...3.2...3.3...1.3...3.3...3.2...3.3...3.3...2.3...3.3
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...1.1...1.1...1.1...1.1...1.1...1.1...1.1...1.1...1.3...1.3...1.3...1.3...1.3
...2.3...2.3...1.2...1.2...1.2...1.1...1.3...1.3...2.2...2.3...2.3...1.3...1.3
...2.3...3.3...1.3...3.2...3.3...2.3...2.2...2.3...2.2...2.3...3.3...2.2...2.3
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CROSSREFS
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Sequence in context: A166728 A136892 A135036 this_sequence A001701 A094162 A060101
Adjacent sequences: A166793 A166794 A166795 this_sequence A166797 A166798 A166799
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net) Oct 21 2009
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