a(n) = (binomial(2*p,p) - 2)/p, where p = prime(n).
A177454
a(n) = (binomial(2*p,p) - 2)/p, where p = prime(n).
Terms
- a(0) =2a(1) =6a(2) =50a(3) =490a(4) =64130a(5) =800046a(6) =137270954a(7) =1860277042a(8) =357975249026
External references
- oeis: A177454