A047183 Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n-2)/2.

0, 0, 0, 3, 6, 13, 25, 45, 91, 154, 322, 525, 1125, 1793, 3921, 6153, 13671, 21206, 47718, 73359, 166800, 254607, 583947, 886171, 2047375, 3091971, 7188451, 10811671, 25272481, 37877401, 88959929, 132924649, 313498639

Offset

1,4

Links

Table of n, a(n) for n=1..33.

Crossrefs

Sequence in context: A199403 A006017 A147323 * A047194 A048039 A339617

Adjacent sequences: A047180 A047181 A047182 * A047184 A047185 A047186

Keyword

nonn

Author

Clark Kimberling

Status

approved