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A180787
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Number of distinct solutions of sum{i=1..5}(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, 1, 5, 64, 400, 1914, 7589, 24902, 73134, 188315, 455127, 996083, 2098908, 4080930, 7790731, 13869018, 24527424, 40768032, 67955336, 106952861, 169909977, 255608028, 390623704, 566247614, 837326375, 1175991196, 1690928973
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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 5 1..2 pairs = 1 (mod 3) are
(1*1 + 1*1 + 1*1 + 1*2 + 1*2) (1*1 + 1*1 + 1*2 + 1*2 + 2*2)
(1*1 + 1*2 + 1*2 + 2*2 + 2*2) (1*2 + 1*2 + 1*2 + 1*2 + 1*2)
(1*2 + 1*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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