A048078 Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n+2)/3.

0, 0, 0, 0, 0, 0, 6, 10, 15, 60, 84, 112, 280, 360, 450, 1110, 1430, 1815, 5775, 7735, 10192, 33124, 44100, 57680, 170968, 223720, 288456, 846600, 1105800, 1427850, 4401540, 5784240, 7521360, 23544510, 30936334, 40225735, 124110415

Offset

1,7

Links

Table of n, a(n) for n=1..37.

Crossrefs

Sequence in context: A357529 A048017 A332392 * A229276 A319035 A117309

Adjacent sequences: A048075 A048076 A048077 * A048079 A048080 A048081

Keyword

nonn

Author

Clark Kimberling

Status

approved