A280884 Number of set partitions of [n] into exactly six blocks where sizes of distinct blocks are coprime.

1, 21, 56, 1386, 252, 18942, 28512, 837837, 122122, 17600583, 1445808, 140411908, 301302288, 10781435088, 79318464, 333208994139, 6813685494, 597189699029, 582524800704, 89346032143830, 3151550453480, 1467268659100530, 1095411461933880, 45383787697612455

Offset: 6

Author

Alois P. Heinz, Jan 09 2017

Keywords

• nonn

Links

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

Crossrefs

Column k=6 of A280880.