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A180788
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Number of distinct solutions of sum{i=1..6}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1
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1
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0, 0, 9, 112, 1004, 6404, 32890, 137528, 499641, 1579113, 4551268, 11861187, 29034355, 65777365, 142805210, 291148080, 576393509, 1082580072, 1993354411, 3505999065, 6088877416, 10148269838, 16796812567, 26776385524, 42563703291
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OFFSET
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1,3
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COMMENTS
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LINKS
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EXAMPLE
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Solutions for sum of products of 6 1..2 pairs = 1 (mod 3) are
(1*1 + 1*1 + 1*1 + 1*1 + 1*1 + 1*2) (1*1 + 1*1 + 1*1 + 1*1 + 1*2 + 2*2)
(1*1 + 1*1 + 1*1 + 1*2 + 2*2 + 2*2) (1*1 + 1*1 + 1*2 + 1*2 + 1*2 + 1*2)
(1*1 + 1*1 + 1*2 + 2*2 + 2*2 + 2*2) (1*1 + 1*2 + 1*2 + 1*2 + 1*2 + 2*2)
(1*1 + 1*2 + 2*2 + 2*2 + 2*2 + 2*2) (1*2 + 1*2 + 1*2 + 1*2 + 2*2 + 2*2)
(1*2 + 2*2 + 2*2 + 2*2 + 2*2 + 2*2)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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