(1/p)*(binomial(2*p,p)+2*(p-1)), where p = n-th prime.
A128893
(1/p)*(binomial(2*p,p)+2*(p-1)), where p = n-th prime.
Terms
- a(0) =4a(1) =8a(2) =52a(3) =492a(4) =64132a(5) =800048a(6) =137270956a(7) =1860277044a(8) =357975249028
External references
- oeis: A128893