a(n) = 3^n*(Gamma(n+1/3)/Gamma(1/3) + (n-1)!).

A123333

a(n) = 3^n*(Gamma(n+1/3)/Gamma(1/3) + (n-1)!).

Terms

    a(0) =4a(1) =13a(2) =82a(3) =766a(4) =9472a(5) =145720a(6) =2681200a(7) =57411760a(8) =1402226560a(9) =38468725120

External references