A048025 Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-2)/3.

0, 0, 0, 0, 0, 1, 6, 12, 42, 112, 168, 378, 759, 1014, 1914, 3564, 4620, 9295, 20020, 27027, 63083, 146648, 199304, 456484, 1007454, 1339464, 2896664, 6165494, 8093214, 17441739, 37871064, 49876200, 111029050, 247813500

Offset

1,7

Links

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

Crossrefs

Sequence in context: A152787 A060551 A129113 * A120471 A219522 A034529

Adjacent sequences: A048022 A048023 A048024 * A048026 A048027 A048028

Keyword

nonn

Author

Clark Kimberling

Status

approved