Expansion of sum ( q^n / product( 1-q^k, k=1..4*n), n=0..inf ).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =12a(6) =18a(7) =28a(8) =41a(9) =60a(10) =85a(11) =119a(12) =164a(13) =225a(14) =304a(15) =408a(16) =542a(17) =716a(18) =938a(19) =1222a(20) =1582a(21) =2037a(22) =2609a(23) =3326a(24) =4220a(25) =5332a(26) =6708a(27) =8407a(28) =10497a(29) =13061