A047175 Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-1)/2.

0, 0, 0, 0, 0, 0, 4, 5, 20, 24, 60, 70, 161, 188, 476, 567, 1512, 1820, 4740, 5709, 14520, 17500, 44572, 53911, 138567, 168245, 433433, 527540, 1355900, 1652924, 4243148, 5180903, 13308416, 16276632

Offset

1,7

Links

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

Crossrefs

Sequence in context: A050251 A125995 A080610 * A133632 A163141 A182584

Adjacent sequences: A047172 A047173 A047174 * A047176 A047177 A047178

Keyword

nonn

Author

Clark Kimberling

Status

approved