OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..47
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 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Jan 28 2003
EXTENSIONS
Definition corrected by Eric Rowland, Jun 23 2017
STATUS
approved