a(n) = n! * [x^n] 1/(1 - 3*x)^(n/3).

A303486

a(n) = n! * [x^n] 1/(1 - 3*x)^(n/3).

Terms

    a(0) =1a(1) =1a(2) =10a(3) =162a(4) =3640a(5) =104720a(6) =3674160a(7) =152152000a(8) =7264216960a(9) =392841187200

External references