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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =22a(7) =55a(8) =141a(9) =370a(10) =986a(11) =2662a(12) =7264a(13) =20006a(14) =55534a(15) =155219a(16) =436456a(17) =1233822a(18) =3504482a(19) =9996417a(20) =28624038a(21) =82248498a(22) =237082689a(23) =685375920a(24) =1986604360a(25) =5772399530a(26) =16810591254a(27) =49059068617a(28) =143450142998a(29) =420213814655