G.f. A(x) satisfies: A(x) = x * (1 + A(x) + A(x^2)^2 + A(x^3)^3 + ...).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =4a(8) =7a(9) =8a(10) =12a(11) =12a(12) =22a(13) =22a(14) =32a(15) =38a(16) =56a(17) =56a(18) =90a(19) =90a(20) =132a(21) =150a(22) =204a(23) =204a(24) =326a(25) =327a(26) =437a(27) =489a(28) =677a(29) =677