A305780 Number of set partitions of [n] with alternating parity of elements and exactly six blocks.

1, 6, 27, 108, 409, 1558, 5692, 21328, 76468, 282885, 999383, 3656887, 12772925, 46306978, 160408850, 577077226, 1987559778, 7105490315, 24379316121, 86719101209, 296819500851, 1051663900480, 3594472289644, 12696988924724, 43364647235536, 152825304753761

Offset

6,2

Links

Table of n, a(n) for n=6..31.

Wikipedia, Partition of a set

Crossrefs

Column k=6 of A274581.

Sequence in context: A119852 A220529 A027471 * A037695 A318638 A094829

Adjacent sequences: A305777 A305778 A305779 * A305781 A305782 A305783

Keyword

nonn

Author

Alois P. Heinz, Jun 10 2018

Status

approved