OFFSET
0,5
LINKS
Indranil Ghosh, Table of n, a(n) for n = 0..400
FORMULA
a(n) = Sum_{k=0..floor(n/2)} stirling2(n, k).
MATHEMATICA
Table[Sum[StirlingS2[n, k], {k, 0, n/2}], {n, 0, 25}]
PROG
(PARI) a(n) = sum(k=0, n\2, stirling(n, k, 2)); \\ Michel Marcus, Oct 11 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Reshetnikov, Oct 10 2016
STATUS
approved