Expansion of (1/x) * Series_Reversion( x * (1-x-x^4/(1-x)^2) ).

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =51a(6) =187a(7) =715a(8) =2800a(9) =11138a(10) =44846a(11) =182476a(12) =749566a(13) =3105575a(14) =12966165a(15) =54505650a(16) =230508612a(17) =980045835a(18) =4186600220a(19) =17960356014a(20) =77343359518a(21) =334217730014