Expansion of (1/x) * Series_Reversion( x * (1-x)^3 / (1-x+x^2)^3 ).

Terms

a(0) =1a(1) =0a(2) =3a(3) =3a(4) =24a(5) =54a(6) =283a(7) =900a(8) =4098a(9) =15286a(10) =66555a(11) =268173a(12) =1156951a(13) =4852722a(14) =21007605a(15) =90167059a(16) =393152058a(17) =1712432070a(18) =7524092134a(19) =33112353060a(20) =146518404963a(21) =649861681966