A048085 Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n+3)/3.

0, 0, 0, 0, 2, 3, 12, 30, 40, 86, 182, 245, 560, 1270, 1784, 4070, 9020, 12782, 28679, 63518, 91286, 205478, 455966, 662151, 1485624, 3290520, 4814672, 10782222, 23878212, 35172819, 78678468, 174179258, 257964134, 576312440

Offset

1,5

Links

Table of n, a(n) for n=1..34.

Crossrefs

Sequence in context: A089414 A260631 A195913 * A069062 A356017 A025560

Adjacent sequences: A048082 A048083 A048084 * A048086 A048087 A048088

Keyword

nonn

Author

Clark Kimberling

Status

approved