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

Terms

a(0) =1a(1) =0a(2) =1a(3) =4a(4) =12a(5) =40a(6) =148a(7) =560a(8) =2146a(9) =8388a(10) =33342a(11) =134156a(12) =545270a(13) =2236052a(14) =9240569a(15) =38442132a(16) =160863078a(17) =676643112a(18) =2859395393a(19) =12133698984a(20) =51682169306a(21) =220884643964a(22) =946970338569