A048048 - 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

A048048

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

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 10, 11, 66, 72, 78, 273, 294, 315, 840, 896, 952, 2142, 2268, 2394, 4959, 5230, 5502, 12012, 12705, 13409, 34914, 37224, 39600, 117975, 126412, 135135, 405405, 434434, 464464, 1309959, 1400455

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

OFFSET

1,14

LINKS

Table of n, a(n) for n=1..45.

CROSSREFS

Sequence in context: A227801 A048031 A048013 * A136835 A031166 A202706

Adjacent sequences: A048045 A048046 A048047 * A048049 A048050 A048051

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved