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

Terms

a(0) =1a(1) =6a(2) =39a(3) =224a(4) =1131a(5) =5412a(6) =24411a(7) =105078a(8) =435048a(9) =1740312a(10) =6755877a(11) =25533330a(12) =94205738a(13) =340064322a(14) =1203313782a(15) =4180514846a(16) =14279610417a(17) =48013553310a(18) =159086287869a(19) =519912616614