a(n) = (2*C(3p,p) - 9*C(2p,p) + 12) / p^5, where p = prime(n).

A268589

a(n) = (2*C(3p,p) - 9*C(2p,p) + 12) / p^5, where p = prime(n).

Terms

    a(0) =12a(1) =2364a(2) =43500a(3) =20791626a(4) =514377588a(5) =373783661124

External references