OFFSET
0,5
COMMENTS
Number of partitions of an n-set into floor(n/2) nonempty subsets.
MATHEMATICA
Table[StirlingS2[n, Floor[n/2]], {n, 0, 25}] (* Amiram Eldar, Apr 20 2021 *)
PROG
(PARI) a(n) = stirling(n, n\2, 2); \\ Michel Marcus, Apr 20 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, Apr 20 2021
STATUS
approved