G.f. satisfies: A(x) = x*Product_{n>=1} (1 + x*A(x)^n).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =5a(6) =9a(7) =23a(8) =49a(9) =120a(10) =279a(11) =682a(12) =1654a(13) =4079a(14) =10129a(15) =25277a(16) =63639a(17) =160685a(18) =408373a(19) =1041197a(20) =2666364a(21) =6850405a(22) =17657214a(23) =45644461a(24) =118303445a(25) =307385607a(26) =800463683a(27) =2088900834a(28) =5461793800a(29) =14306839474