A305779 Number of set partitions of [n] with alternating parity of elements and exactly five blocks.

1, 5, 19, 62, 204, 627, 2006, 6045, 19091, 56804, 177431, 523072, 1618006, 4739853, 14544372, 42440871, 129419597, 376877914, 1143885829, 3328765378, 10068808024, 29308488795, 88433869354, 257651383313, 776063514999, 2264100874960, 6811218232163, 19903182431380

Offset

5,2

Links

Table of n, a(n) for n=5..32.

Wikipedia, Partition of a set

Crossrefs

Column k=5 of A274581.

Sequence in context: A173627 A295288 A141397 * A143131 A036677 A003296

Adjacent sequences: A305776 A305777 A305778 * A305780 A305781 A305782

Keyword

nonn

Author

Alois P. Heinz, Jun 10 2018

Status

approved