A048081 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A048081

Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n+2)/3.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 9, 10, 60, 66, 72, 252, 273, 294, 784, 840, 896, 2016, 2142, 2268, 4689, 4959, 5230, 11330, 12012, 12705, 32670, 34914, 37224, 109824, 117975, 126412, 377377, 405405, 434434, 1222494, 1309959

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,13

LINKS

Table of n, a(n) for n=1..44.

CROSSREFS

Sequence in context: A048020 A363760 A048000 * A109936 A114460 A120201

Adjacent sequences: A048078 A048079 A048080 * A048082 A048083 A048084

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved