OFFSET
0,7
LINKS
Tilman Piesk, Table of n, a(n) for n = 0..9999
Tilman Piesk, Illustrated list of the first 52 equivalence relations
Tilman Piesk, Permutations and partitions in the OEIS (Wikiversity)
EXAMPLE
The 6th set partition has 2 non-singleton blocks {1,4} and {2,3}. So a(6) = 2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Tilman Piesk, Nov 02 2014
STATUS
approved