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

Terms

a(0) =1a(1) =1a(2) =2a(3) =8a(4) =23a(5) =64a(6) =160a(7) =397a(8) =968a(9) =2372a(10) =5714a(11) =13617a(12) =32007a(13) =74396a(14) =171222a(15) =390629a(16) =883922a(17) =1984631a(18) =4423528a(19) =9790146a(20) =21524829a(21) =47027558a(22) =102135967a(23) =220565018a(24) =473743833a(25) =1012274948a(26) =2152271718a(27) =4554344649a(28) =9593260912a(29) =20118418061