G.f. satisfies: A(x) = 1/(1-x) * A(x^2)*A(x^3)*A(x^4)*...*A(x^n)*...

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =8a(6) =15a(7) =20a(8) =35a(9) =48a(10) =76a(11) =103a(12) =166a(13) =221a(14) =333a(15) =451a(16) =671a(17) =894a(18) =1303a(19) =1730a(20) =2479a(21) =3288a(22) =4615a(23) =6086a(24) =8502a(25) =11142a(26) =15299a(27) =20034a(28) =27285a(29) =35514