G.f.: 1/(1+x) * Product_{k>=1} 1/(1-x^k)^k.

Terms

a(0) =1a(1) =0a(2) =3a(3) =3a(4) =10a(5) =14a(6) =34a(7) =52a(8) =108a(9) =174a(10) =326a(11) =533a(12) =946a(13) =1539a(14) =2628a(15) =4251a(16) =7046a(17) =11288a(18) =18313a(19) =29017a(20) =46261a(21) =72533a(22) =113942a(23) =176841a(24) =274353a(25) =421680a(26) =647065a(27) =985593a(28) =1497641a(29) =2261971