a(n) = Sum_{k=1..prime(n)} binomial(2k,k).

A146977

a(n) = Sum_{k=1..prime(n)} binomial(2k,k).

Terms

    a(0) =8a(1) =28a(2) =350a(3) =4706a(4) =956384a(5) =14061140a(6) =3143981870a(7) =47564380970

External references