A280886 Number of set partitions of [n] into exactly eight blocks where sizes of distinct blocks are coprime.

1, 36, 120, 4950, 792, 97812, 171600, 8384805, 972400, 233084280, 14734512, 2345611788, 5678805120, 343522980720, 1221436128, 13374187844391, 185339038104, 22390031621100, 18903665638000, 5148292859617050, 118997530835040, 97446697480400580, 78169931776006200

Offset

8,2

Links

Table of n, a(n) for n=8..30.

Wikipedia, Coprime integers

Wikipedia, Partition of a set

Crossrefs

Column k=8 of A280880.

Sequence in context: A254146 A173420 A271736 * A278022 A333007 A016862

Adjacent sequences: A280883 A280884 A280885 * A280887 A280888 A280889

Keyword

nonn

Author

Alois P. Heinz, Jan 09 2017

Status

approved