Number of distinct solutions of sum{i=1..4}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.

Terms

a(0) =0a(1) =1a(2) =3a(3) =34a(4) =145a(5) =522a(6) =1518a(7) =4041a(8) =9150a(9) =19970a(10) =38555a(11) =74370a(12) =128040a(13) =224434a(14) =358988a(15) =587014a(16) =876114a(17) =1372578a(18) =1941624a(19) =2912816a(20) =4001868a(21) =5742391a(22) =7599933a(23) =10831065a(24) =13788935a(25) =18946564a(26) =24080514a(27) =32270596a(28) =39619720a(29) =53256875