Series reversion of g.f. A(x) is -A(-x).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =17a(7) =38a(8) =87a(9) =203a(10) =482a(11) =1160a(12) =2822a(13) =6929a(14) =17149a(15) =42736a(16) =107144a(17) =270060a(18) =683940a(19) =1739511a(20) =4441255a(21) =11378814a(22) =29245927a(23) =75386341a(24) =194838673a(25) =504802508a(26) =1310843123a(27) =3411070838a(28) =8893590454a(29) =23230151872