a(n) = ((p+1)*(3p)!/((2p-1)!*(p+1)!*2p) - 3)/(3p^3), where p is the n-th prime.

A217772

a(n) = ((p+1)*(3p)!/((2p-1)!*(p+1)!*2p) - 3)/(3p^3), where p is the n-th prime.

Terms

    a(0) =1a(1) =8a(2) =113a(3) =48469a(4) =1232351a(5) =1002175798a(6) =30956114561

External references