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

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =13a(5) =23a(6) =36a(7) =62a(8) =78a(9) =123a(10) =150a(11) =238a(12) =255a(13) =355a(14) =427a(15) =567a(16) =580a(17) =864a(18) =810a(19) =1202a(20) =1232a(21) =1471a(22) =1452a(23) =2310a(24) =1960a(25) =2479a(26) =2712a(27) =3414a(28) =2947a(29) =4649