Expansion of Sum_{k>=0} x^(k*(k+1)) / Product_{j=1..k} (1 - x^j)^j.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =2a(8) =4a(9) =4a(10) =7a(11) =7a(12) =12a(13) =12a(14) =19a(15) =22a(16) =31a(17) =37a(18) =54a(19) =63a(20) =89a(21) =111a(22) =146a(23) =184a(24) =247a(25) =301a(26) =398a(27) =501a(28) =642a(29) =804