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

Terms

a(0) =1a(1) =2a(2) =5a(3) =10a(4) =23a(5) =40a(6) =85a(7) =147a(8) =276a(9) =474a(10) =858a(11) =1421a(12) =2484a(13) =4079a(14) =6850a(15) =11137a(16) =18333a(17) =29277a(18) =47329a(19) =74768a(20) =118703a(21) =185614a(22) =290782a(23) =449568a(24) =696009a(25) =1066258a(26) =1632376a(27) =2479057a(28) =3759611a(29) =5661568