Expansion of Product_{m>=1} (1+x^m)^13.

Terms

a(0) =1a(1) =13a(2) =91a(3) =468a(4) =1989a(5) =7384a(6) =24739a(7) =76427a(8) =220948a(9) =604175a(10) =1575392a(11) =3941847a(12) =9511944a(13) =22226049a(14) =50458447a(15) =111609537a(16) =241099027a(17) =509680951a(18) =1056262792a(19) =2149214288a(20) =4299359012a(21) =8465605408a(22) =16424772637a(23) =31429372312a(24) =59365381608a(25) =110770031489a(26) =204315725953a(27) =372772306309a(28) =673125106316