A280887 Number of set partitions of [n] into exactly nine blocks where sizes of distinct blocks are coprime.

1, 45, 165, 8415, 1287, 195195, 366795, 22046310, 2358070, 693870606, 39982878, 7765924530, 19829897010, 1474459789770, 4013220090, 63387586762335, 769009559175, 106739428871075, 85029993637875, 28720696235896665, 574973722599705, 581923529546044725

Offset

9,2

Links

Table of n, a(n) for n=9..30.

Wikipedia, Coprime integers

Wikipedia, Partition of a set

Crossrefs

Column k=9 of A280880.

Sequence in context: A061658 A254147 A271737 * A158630 A158634 A091197

Adjacent sequences: A280884 A280885 A280886 * A280888 A280889 A280890

Keyword

nonn

Author

Alois P. Heinz, Jan 09 2017

Status

approved