Expansion of Product_{m>=1} (1+x^m)^4.

Terms

a(0) =1a(1) =4a(2) =10a(3) =24a(4) =51a(5) =100a(6) =190a(7) =344a(8) =601a(9) =1024a(10) =1702a(11) =2768a(12) =4422a(13) =6948a(14) =10752a(15) =16424a(16) =24782a(17) =36972a(18) =54602a(19) =79872a(20) =115805a(21) =166540a(22) =237664a(23) =336720a(24) =473856a(25) =662596a(26) =920934a(27) =1272728a(28) =1749407a(29) =2392268