OFFSET
1,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..573
Wikipedia, Partition of a set
FORMULA
a(n) = A271466(n+4,n).
EXAMPLE
a(3) = 18: 124567|3, 14567|23, 14567|2|3, 1456|27|3, 1457|26|3, 145|267|3, 1467|25|3, 146|257|3, 147|256|3, 14|2567|3, 1567|24|3, 156|247|3, 157|246|3, 15|2467|3, 167|245|3, 16|2457|3, 17|2456|3, 1|24567|3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Apr 13 2016
STATUS
approved