A305781 Number of set partitions of [n] with alternating parity of elements and exactly seven blocks.

1, 7, 37, 169, 763, 3287, 14402, 60752, 261772, 1085823, 4614736, 18868613, 79286687, 320425251, 1333901662, 5341972670, 22066221462, 87764483463, 360206083844, 1425407602339, 5819322422329, 22944438320083, 93269292846714, 366809712490908, 1485913213777040

Offset

7,2

Links

Table of n, a(n) for n=7..31.

Wikipedia, Partition of a set

Crossrefs

Column k=7 of A274581.

Sequence in context: A049495 A169789 A169726 * A172063 A208737 A005061

Adjacent sequences: A305778 A305779 A305780 * A305782 A305783 A305784

Keyword

nonn

Author

Alois P. Heinz, Jun 10 2018

Status

approved