Expansion of Product_{m>=1} (1+x^m)^18.

Terms

a(0) =1a(1) =18a(2) =171a(3) =1158a(4) =6309a(5) =29430a(6) =121962a(7) =460008a(8) =1605996a(9) =5254334a(10) =16260867a(11) =47949804a(12) =135509922a(13) =368764290a(14) =970099191a(15) =2475106170a(16) =6141671649a(17) =14856839874a(18) =35107961175a(19) =81189855828a(20) =184033842021a(21) =409446105486a(22) =895231350108