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

Terms

a(0) =0a(1) =4a(2) =18a(3) =50a(4) =136a(5) =262a(6) =583a(7) =974a(8) =1794a(9) =2603a(10) =4560a(11) =6190a(12) =9987a(13) =12617a(14) =19419a(15) =24264a(16) =35818a(17) =41262a(18) =61133a(19) =70126a(20) =97274a(21) =110076a(22) =154038a(23) =167176a(24) =230205a(25) =247554a(26) =328518a(27) =357811a(28) =476360a(29) =485118