a(n) = 2^n*binomial(3*n,n)*(3*n+2).

A072976

a(n) = 2^n*binomial(3*n,n)*(3*n+2).

Terms

    a(0) =2a(1) =30a(2) =480a(3) =7392a(4) =110880a(5) =1633632a(6) =23761920a(7) =342328320a(8) =4895294976a(9) =69589977600a(10) =984515051520

External references