A280885 Number of set partitions of [n] into exactly seven blocks where sizes of distinct blocks are coprime.

1, 28, 84, 2730, 462, 45276, 73788, 2849847, 365365, 69293224, 4913272, 623100660, 1424294340, 67844069880, 333126696, 2369968906305, 38838853515, 4030108023172, 3637504185700, 767066790520030, 21258921662550, 13536000500234940, 10485013256679780

Offset: 7

Author

Alois P. Heinz, Jan 09 2017

Keywords

• nonn

Links

• Wikipedia, Coprime integers
• Wikipedia, Partition of a set

Crossrefs

Column k=7 of A280880.