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A280887
Number of set partitions of [n] into exactly nine blocks where sizes of distinct blocks are coprime.
1
1, 45, 165, 8415, 1287, 195195, 366795, 22046310, 2358070, 693870606, 39982878, 7765924530, 19829897010, 1474459789770, 4013220090, 63387586762335, 769009559175, 106739428871075, 85029993637875, 28720696235896665, 574973722599705, 581923529546044725
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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
A392844
Adjacent sequences:
A280884
A280885
A280886
*
A280888
A280889
A280890
KEYWORD
nonn
AUTHOR
Alois P. Heinz
, Jan 09 2017
STATUS
approved
