Number of fixed points of Gamma_0 (n) of type i.

Terms

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