OFFSET
1,3
COMMENTS
Each set partition is written as a sequence of blocks, ordered by the smallest elements in the blocks.
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..200
Wikipedia, Partition of a set
FORMULA
a(n) = A271466(2n,n).
EXAMPLE
a(2) = 1: 134|2.
a(3) = 10: 12456|3, 1456|23, 1456|2|3, 145|26|3, 146|25|3, 14|256|3, 156|24|3, 15|246|3, 16|245|3, 1|2456|3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Apr 08 2016
STATUS
approved