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

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =15a(6) =32a(7) =111a(8) =210a(9) =497a(10) =768a(11) =1751a(12) =2233a(13) =4209a(14) =5869a(15) =9758a(16) =11636a(17) =20111a(18) =22526a(19) =36545a(20) =42994a(21) =60736a(22) =67992a(23) =108343a(24) =111052a(25) =156047a(26) =179695a(27) =243023a(28) =250355a(29) =372867