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A180777
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Number of distinct solutions of sum{i=1..6}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1
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1
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0, 1, 12, 118, 995, 6518, 32893, 139369, 499659, 1599064, 4551225, 12014040, 29034510, 66658219, 142828285, 295240250, 576393604, 1098913338, 1993354080, 3560486370, 6091808112, 10312711744, 16796812703, 27247744649, 42564714900
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OFFSET
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1,3
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COMMENTS
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Column 6 of A180782
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LINKS
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R. H. Hardin, Table of n, a(n) for n=1..183
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EXAMPLE
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Solutions for sum of products of 6 1..2 pairs = 0 (mod 3) are
(1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*1) (1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 2*2)
(1*1 + 1*1 + 1*1 + 1*1 + 2*2 + 2*2) (1*1 + 1*1 + 1*1 + 1*2 + 1*2 + 1*2)
(1*1 + 1*1 + 1*1 + 2*2 + 2*2 + 2*2) (1*1 + 1*1 + 1*2 + 1*2 + 1*2 + 2*2)
(1*1 + 1*1 + 2*2 + 2*2 + 2*2 + 2*2) (1*1 + 1*2 + 1*2 + 1*2 + 2*2 + 2*2)
(1*1 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2) (1*2 + 1*2 + 1*2 + 1*2 + 1*2 + 1*2)
(1*2 + 1*2 + 1*2 + 2*2 + 2*2 + 2*2) (2*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2)
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CROSSREFS
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Sequence in context: A154346 A016142 A105218 * A163950 A025132 A001712
Adjacent sequences: A180774 A180775 A180776 * A180778 A180779 A180780
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Sep 20 2010
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STATUS
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approved
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