Expansion of (1/x) * Series_Reversion( x / ((1+x) * (1+x+x^3)) ).

Terms

a(0) =1a(1) =2a(2) =5a(3) =15a(4) =51a(5) =187a(6) =718a(7) =2844a(8) =11530a(9) =47612a(10) =199576a(11) =847013a(12) =3632468a(13) =15717041a(14) =68527255a(15) =300780438a(16) =1327939406a(17) =5893299392a(18) =26275243626a(19) =117635107818a(20) =528631769323