OFFSET
0,4
LINKS
Wikipedia, Partition of a set
FORMULA
a(n) = A274581(n,ceiling(n/2)).
EXAMPLE
a(5) = 7: 123|4|5, 12|34|5, 12|3|45, 1|234|5, 145|2|3, 1|2|345, 1|23|45.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jun 10 2018
STATUS
approved