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

Terms

a(0) =1a(1) =3a(2) =12a(3) =52a(4) =228a(5) =969a(6) =3795a(7) =12285a(8) =19227a(9) =-162316a(10) =-2334219a(11) =-20233746a(12) =-146642814a(13) =-956899038a(14) =-5761740810a(15) =-32172133140a(16) =-164988072288a(17) =-752632536117