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

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