Genus of modular curve X_1(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =1a(11) =0a(12) =2a(13) =1a(14) =1a(15) =2a(16) =5a(17) =2a(18) =7a(19) =3a(20) =5a(21) =6a(22) =12a(23) =5a(24) =12a(25) =10a(26) =13a(27) =10a(28) =22a(29) =9