A048045 Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n+1)/3.

0, 0, 0, 0, 0, 0, 0, 10, 15, 21, 84, 112, 144, 360, 450, 550, 1430, 1815, 2275, 7735, 10192, 13230, 44100, 57680, 74256, 223720, 288456, 367080, 1105800, 1427850, 1824690, 5784240, 7521360, 9684840, 30936334, 40225735, 51798175

Offset

1,8

Links

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

Crossrefs

Shares a bisection with A047200.

Sequence in context: A013638 A075524 A048028 * A257631 A115682 A075523

Adjacent sequences: A048042 A048043 A048044 * A048046 A048047 A048048

Keyword

nonn

Author

Clark Kimberling

Status

approved