OFFSET
1,4
COMMENTS
A multiset is periodic if its multiplicities have a common divisor greater than 1. For this sequence neither the parts nor their multiset union are required to be periodic, only the multiset of parts.
EXAMPLE
Non-isomorphic representatives of the a(4) = 4 multiset partitions are {{1,1},{1,1}}, {{1,2},{1,2}}, {{1},{1},{1},{1}}, {{1},{1},{2},{2}}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Apr 26 2018
EXTENSIONS
More terms from Jinyuan Wang, Jun 21 2020
STATUS
approved