OFFSET
0,4
COMMENTS
Number of partitions of an n-set into ceiling(n/2) nonempty subsets.
MATHEMATICA
Table[StirlingS2[n, Ceiling[n/2]], {n, 0, 25}] (* Amiram Eldar, Apr 20 2021 *)
PROG
(PARI) a(n) = stirling(n, ceil(n/2), 2); \\ Michel Marcus, Apr 20 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, Apr 20 2021
STATUS
approved