Expansion of Product_{m>=1} (1+x^m)^2.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =9a(5) =14a(6) =22a(7) =32a(8) =46a(9) =66a(10) =93a(11) =128a(12) =176a(13) =238a(14) =319a(15) =426a(16) =562a(17) =736a(18) =960a(19) =1242a(20) =1598a(21) =2048a(22) =2608a(23) =3306a(24) =4175a(25) =5248a(26) =6570a(27) =8198a(28) =10190a(29) =12622