Series reversion of x-x^3-x^4.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =7a(6) =16a(7) =45a(8) =110a(9) =308a(10) =819a(11) =2275a(12) =6328a(13) =17748a(14) =50388a(15) =143412a(16) =411939a(17) =1187329a(18) =3441559a(19) =10015005a(20) =29255655a(21) =85766655a(22) =252201690a(23) =743819115a(24) =2199446652a(25) =6519727800a(26) =19369551936a(27) =57665571072a(28) =172011364452a(29) =514021640564