Number of distinct solutions of sum{i=1..8}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2.

A180831

Number of distinct solutions of sum{i=1..8}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =9a(5) =166a(6) =3474a(7) =36866a(8) =345458a(9) =2263066a(10) =13182593a(11) =61265760a(12) =260084494a(13) =944238967a(14) =3208593348a(15) =9709481260a(16) =27970062531a(17) =73672570068a(18) =187003944842a(19) =441746651920

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