Series reversion of x/(1+5x+4x^2).

Terms

a(0) =0a(1) =1a(2) =5a(3) =29a(4) =185a(5) =1257a(6) =8925a(7) =65445a(8) =491825a(9) =3768209a(10) =29324405a(11) =231153133a(12) =1841801065a(13) =14810069497a(14) =120029657805a(15) =979470140661