G.f. satisfies: A(x) = 3*x - x^2 - 2*Series_Reversion( A(x) ).

A139086

G.f. satisfies: A(x) = 3*x - x^2 - 2*Series_Reversion( A(x) ).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =30a(4) =316a(5) =4116a(6) =62296a(7) =1058418a(8) =19764860a(9) =400070484a(10) =8693577528a(11) =201394483524

External references