G.f.: A(x) = exp( Sum_{n>=1} x^n/n * Product_{k>=1} (1 + x^(n*k)) ).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =16a(7) =25a(8) =42a(9) =65a(10) =105a(11) =162a(12) =256a(13) =391a(14) =605a(15) =918a(16) =1401a(17) =2106a(18) =3176a(19) =4739a(20) =7076a(21) =10482a(22) =15518a(23) =22833a(24) =33556a(25) =49068a(26) =71633a(27) =104153a(28) =151155a(29) =218609