Number of distinct solutions of sum{i=1..3}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.

Terms

a(0) =0a(1) =0a(2) =5a(3) =14a(4) =42a(5) =119a(6) =253a(7) =526a(8) =944a(9) =1702a(10) =2655a(11) =4510a(12) =6284a(13) =9867a(14) =13519a(15) =19980a(16) =25128a(17) =37286a(18) =44562a(19) =63802a(20) =76850a(21) =102370a(22) =118591a(23) =168208a(24) =183320a(25) =241554a(26) =279852a(27) =359754a(28) =387016a(29) =528861