A079601 (A000670(2*p - 1) - 1)/(6*p) where p runs through the primes.

1, 30, 236242, 12544246390, 1229164015128849604270, 1367914941518920202892096130, 10989801394147610473210727542088302770490, 67520322268089344459189867921056960354422886750

Offset: 1

Author

Benoit Cloitre, Jan 28 2003

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..47

Crossrefs

Cf. A000670.

Programs

Mathematica

f[0]=1; f[n_] := f[n] = Sum[Binomial[n, k] * f[n - k], {k, 1, n}]; r[p_] :=  (f[2 p - 1] - 1)/(6 p); r /@ Select[Range[20], PrimeQ] (* Amiram Eldar, Sep 10 2019 *)

Extensions

Definition corrected by Eric Rowland, Jun 23 2017