OFFSET
1,9
EXAMPLE
The a(12) = 5 partitions are (5,4,3), (6,4,2), (7,4,1), (5,4,2,1), (6,3,2,1).
MATHEMATICA
Table[Length[Select[IntegerPartitions[n], UnsameQ@@#&&!UnsameQ@@Mean/@Union[Subsets[#]]&]], {n, 60}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Jul 01 2018
STATUS
approved