OFFSET
0,6
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..300
Wikipedia, Partition of a set
EXAMPLE
a(0) = 1: the empty partition.
a(1) = 1: 1.
a(4) = 1: 1234.
a(5) = 3: 13|25|4, 1|235|4, 1|25|34.
a(6) = 9: 136|25|4, 13|256|4, 13|25|46, 16|235|4, 1|2356|4, 1|235|46, 16|25|34, 1|256|34, 1|25|346.
a(7) = 17: 1234567, 136|25|4|7, 13|256|4|7, 13|25|46|7, 13|25|4|67, 16|235|4|7, 1|2356|4|7, 1|235|46|7, 1|235|4|67, 16|25|34|7, 1|256|34|7, 1|25|346|7, 1|25|34|67, 16|25|37|4, 1|256|37|4, 1|25|367|4, 1|25|37|46.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 31 2024
STATUS
approved