Expansion of Product_{k>=1} 1/(1 - x^(k*(k+1)/2))^(k*(k+1)/2).

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =4a(5) =4a(6) =16a(7) =16a(8) =16a(9) =44a(10) =54a(11) =54a(12) =126a(13) =156a(14) =156a(15) =315a(16) =435a(17) =435a(18) =780a(19) =1060a(20) =1115a(21) =1856a(22) =2576a(23) =2741a(24) =4214a(25) =5804a(26) =6464a(27) =9446a(28) =12924a(29) =14464