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

Terms

a(0) =1a(1) =2a(2) =5a(3) =15a(4) =50a(5) =176a(6) =638a(7) =2351a(8) =8735a(9) =32523a(10) =120707a(11) =444218a(12) =1611211a(13) =5714056a(14) =19578953a(15) =63495983a(16) =186784641a(17) =442718804a(18) =396470087a(19) =-4588483661a(20) =-45923198497a(21) =-305945783479