Expansion of Product_{m>=1} (1 + m*q^m).

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =7a(5) =15a(6) =25a(7) =43a(8) =64a(9) =120a(10) =186a(11) =288a(12) =463a(13) =695a(14) =1105a(15) =1728a(16) =2525a(17) =3741a(18) =5775a(19) =8244a(20) =12447a(21) =18302a(22) =26424a(23) =37827a(24) =54729a(25) =78330a(26) =111184a(27) =159538a(28) =225624a(29) =315415