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A272432
Number of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its four immediate predecessors.
2
1, 1, 1, 7, 9, 31, 403, 757, 2873, 12607, 333051, 761377, 3699435, 16383121, 108710085, 4855474267, 28123899993, 241045678351, 2865769028107, 22701288941281, 238433702214659, 4399193720759677, 46157742163810905, 514035796837721671, 8889375296702138075
OFFSET
0,4
LINKS
CROSSREFS
Column k=4 of A261959.
Sequence in context: A032011 A272434 A272433 * A272431 A261961 A177030
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Apr 29 2016
STATUS
approved