G.f.: exp( Sum_{n>=1} A000984(n)*A002426(n)*x^n/n ), where A000984 is the central binomial coefficients and A002426 is the central trinomial coefficients.

A216585

G.f.: exp( Sum_{n>=1} A000984(n)*A002426(n)*x^n/n ), where A000984 is the central binomial coefficients and A002426 is the central trinomial coefficients.

Terms

    a(0) =1a(1) =2a(2) =11a(3) =66a(4) =485a(5) =3842a(6) =32712a(7) =291568a(8) =2697610a(9) =25679316a(10) =250190125a(11) =2484270622a(12) =25062816127a(13) =256275246582

External references