A048067 Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n-4)/2.

0, 0, 0, 0, 0, 0, 0, 0, 0, 21, 28, 112, 144, 360, 450, 1110, 1430, 4235, 5775, 17556, 24388, 68328, 94731, 251160, 349300, 923230, 1301080, 3482710, 4976070, 13287846, 19136832, 50391978, 72898098

Offset

1,10

Links

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

Crossrefs

Sequence in context: A276674 A130202 A162692 * A344603 A212192 A166647

Adjacent sequences: A048064 A048065 A048066 * A048068 A048069 A048070

Keyword

nonn

Author

Clark Kimberling

Status

approved