A047186 Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-2)/2.

0, 0, 0, 0, 0, 0, 0, 5, 6, 24, 28, 70, 80, 188, 216, 567, 665, 1820, 2156, 5709, 6772, 17500, 20800, 53911, 64372, 168245, 201785, 527540, 634556, 1652924, 1992536, 5180903, 6258903, 16276632

Offset

1,8

Links

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

Crossrefs

Sequence in context: A042317 A042027 A042283 * A324485 A335827 A166591

Adjacent sequences: A047183 A047184 A047185 * A047187 A047188 A047189

Keyword

nonn

Author

Clark Kimberling

Status

approved