Expansion of a modular function for Gamma_0(21).

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =8a(5) =13a(6) =29a(7) =44a(8) =66a(9) =122a(10) =184a(11) =269a(12) =448a(13) =668a(14) =972a(15) =1505a(16) =2205a(17) =3153a(18) =4677a(19) =6717a(20) =9480a(21) =13656a(22) =19245a(23) =26793a(24) =37714a(25) =52301a(26) =71894a(27) =99392a(28) =135969a(29) =184637