Coefficients in a certain Poincaré series [or Poincare series].

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =1a(5) =2a(6) =2a(7) =2a(8) =4a(9) =7a(10) =9a(11) =12a(12) =20a(13) =32a(14) =45a(15) =66a(16) =105a(17) =164a(18) =246a(19) =372a(20) =582a(21) =909a(22) =1393a(23) =2146a(24) =3355a(25) =5240a(26) =8132a(27) =12660a(28) =19825a(29) =31051