Expansion of Product_{k>=1} 1/(1 - x^k * (1 + k*x)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =15a(5) =32a(6) =65a(7) =131a(8) =260a(9) =501a(10) =965a(11) =1825a(12) =3419a(13) =6326a(14) =11652a(15) =21230a(16) =38405a(17) =69015a(18) =123334a(19) =218980a(20) =386809a(21) =679757a(22) =1189360a(23) =2071761a(24) =3594325a(25) =6211826a(26) =10698409a(27) =18363038a(28) =31420994a(29) =53605525