OFFSET
0,3
MATHEMATICA
Table[Sum[StirlingS2[n, k]StirlingS2[n+1, k+1]StirlingS2[n+2, k+2], {k, 0, n}], {n, 0, 100}]
PROG
(Maxima) makelist(sum(stirling2(n, k)*stirling2(n+1, k+1)*stirling2(n+2, k+2), k, 0, n), n, 0, 24);
CROSSREFS
KEYWORD
nonn
AUTHOR
Emanuele Munarini, Jul 04 2011
STATUS
approved