Number of solutions to 1 +- 3 +- 5 +- ... +- (2*n-1) == 0 mod n.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =4a(5) =12a(6) =10a(7) =36a(8) =30a(9) =104a(10) =94a(11) =344a(12) =316a(13) =1172a(14) =1096a(15) =4132a(16) =3856a(17) =14572a(18) =13798a(19) =52432a(20) =49940a(21) =190652a(22) =182362a(23) =699416a(24) =671092a(25) =2581112a(26) =2485534a(27) =9586984a(28) =9256396a(29) =35791472