A048032 Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n-3)/3.

0, 0, 0, 0, 0, 5, 15, 35, 70, 141, 261, 405, 765, 1485, 2310, 4954, 10634, 16575, 35945, 75725, 113815, 240385, 502945, 744345, 1595433, 3411849, 5036862, 10959446, 23631286, 34636245, 75326163, 162418479, 236331302, 514828047

Offset

1,6

Links

Table of n, a(n) for n=1..34.

Crossrefs

Sequence in context: A195760 A195761 A100355 * A019499 A229885 A363618

Adjacent sequences: A048029 A048030 A048031 * A048033 A048034 A048035

Keyword

nonn

Author

Clark Kimberling

Status

approved