Expansion of Product_{m>=1} (1 + m^2*q^m).

Terms

a(0) =1a(1) =1a(2) =4a(3) =13a(4) =25a(5) =77a(6) =161a(7) =393a(8) =726a(9) =2010a(10) =3850a(11) =7874a(12) =16791a(13) =31627a(14) =69695a(15) =139560a(16) =255997a(17) =482277a(18) =986021a(19) =1716430a(20) =3544299a(21) =6507128a(22) =11887340a(23) =21137849a(24) =38636535a(25) =70598032a(26) =123697772a(27) =233003286a(28) =412142276a(29) =711896765