Expansion of Product_{m>=1} (1+x^m)^3.

Terms

a(0) =1a(1) =3a(2) =6a(3) =13a(4) =24a(5) =42a(6) =73a(7) =120a(8) =192a(9) =302a(10) =465a(11) =702a(12) =1046a(13) =1536a(14) =2226a(15) =3195a(16) =4536a(17) =6378a(18) =8896a(19) =12306a(20) =16896a(21) =23045a(22) =31224a(23) =42048a(24) =56310a(25) =75000a(26) =99384a(27) =131072a(28) =172071a(29) =224910