Expansion of Product_{k>=1} (Product_{j=1..k} 1/(1 - x^(k*j))^k).

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =15a(5) =26a(6) =57a(7) =101a(8) =202a(9) =358a(10) =670a(11) =1165a(12) =2113a(13) =3614a(14) =6326a(15) =10691a(16) =18275a(17) =30408a(18) =50969a(19) =83716a(20) =137943a(21) =223883a(22) =363547a(23) =583369a(24) =935524a(25) =1485673a(26) =2355496a(27) =3705275a(28) =5815497a(29) =9066696