A272434 Number of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its six immediate predecessors.

1, 1, 1, 7, 9, 31, 403, 757, 2873, 12607, 333051, 761377, 3699435, 16383121, 108710085, 4855474267, 13594184793, 76375572751, 388660153867, 2504206435681, 20148774553859, 1556349601444477, 5050276538344665, 33326552998257031, 186169293932977115, 1305062351972825281, 9600936552132048553, 106019265737746665727, 12708226588208611056333, 98137877588880676995127

Offset

0,4

Links

Alois P. Heinz, Table of n, a(n) for n = 0..50

Crossrefs

Column k=6 of A261959.

Sequence in context: A147186 A131623 A032011 * A272433 A272432 A272431

Adjacent sequences: A272431 A272432 A272433 * A272435 A272436 A272437

Keyword

nonn

Author

Alois P. Heinz, Apr 29 2016

Status

approved