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

Terms

a(0) =1a(1) =4a(2) =8a(3) =20a(4) =28a(5) =56a(6) =64a(7) =122a(8) =150a(9) =218a(10) =216a(11) =424a(12) =346a(13) =544a(14) =667a(15) =863a(16) =733a(17) =1305a(18) =1000a(19) =1752a(20) =1715a(21) =1944a(22) =1728a(23) =3258a(24) =2535a(25) =3142a(26) =3495a(27) =4520a(28) =3382a(29) =6254