Expansion of sum ( q^n / product( 1-q^k, k=1..3*n), n=0..inf ).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =11a(6) =17a(7) =26a(8) =38a(9) =54a(10) =77a(11) =107a(12) =148a(13) =201a(14) =272a(15) =363a(16) =483a(17) =635a(18) =832a(19) =1081a(20) =1399a(21) =1796a(22) =2299a(23) =2924a(24) =3707a(25) =4673a(26) =5874a(27) =7348a(28) =9166a(29) =11384