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

%I #4 May 01 2016 12:23:14

%S 1,1,1,7,9,31,403,757,2873,12607,333051,761377,3699435,16383121,

%T 108710085,4855474267,13594184793,76375572751,388660153867,

%U 2504206435681,20148774553859,1556349601444477,10470804739432665,113472934257201031,1621680033815396315

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

%H Alois P. Heinz, <a href="/A272433/b272433.txt">Table of n, a(n) for n = 0..60</a>

%Y Column k=5 of A261959.

%K nonn

%O 0,4

%A _Alois P. Heinz_, Apr 29 2016