A305783 Number of set partitions of [n] with alternating parity of elements and exactly nine blocks.

1, 9, 61, 359, 2071, 11521, 64536, 351890, 1937292, 10385051, 56327364, 297361209, 1592259558, 8294350334, 43929021137, 226237017737, 1187116072881, 6055309005874, 31524381075907, 159529143743414, 825010507438945, 4148043681253075, 21331478060780614

Offset

9,2

Links

Table of n, a(n) for n=9..31.

Wikipedia, Partition of a set

Crossrefs

Column k=9 of A274581.

Sequence in context: A202660 A202120 A201084 * A005060 A125346 A190666

Adjacent sequences: A305780 A305781 A305782 * A305784 A305785 A305786

Keyword

nonn

Author

Alois P. Heinz, Jun 10 2018

Status

approved