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A048069 Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-4)/2. 0
0, 0, 0, 0, 0, 1, 6, 12, 42, 63, 168, 224, 504, 630, 1270, 1527, 2937, 3465, 6930, 8184, 18304, 21879, 54054, 65065, 165285, 198363, 491128, 584464, 1387744, 1636284, 3757884, 4398954, 9980054 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

CROSSREFS

Sequence in context: A007121 A152786 A206039 * A152787 A060551 A129113

Adjacent sequences:  A048066 A048067 A048068 * A048070 A048071 A048072

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified November 25 16:38 EST 2014. Contains 249998 sequences.