(binomial(2*p,p)-2)/(2*p) where p runs through the primes.

A086655

(binomial(2*p,p)-2)/(2*p) where p runs through the primes.

Terms

    a(0) =1a(1) =3a(2) =25a(3) =245a(4) =32065a(5) =400023a(6) =68635477a(7) =930138521a(8) =178987624513

External references