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A047179
Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n-1)/2.
0
0, 0, 0, 0, 0, 0, 0, 0, 5, 6, 30, 35, 105, 120, 280, 315, 666, 745, 1665, 1881, 4785, 5490, 14850, 17160, 45331, 52339, 131859, 151775, 371735, 427336, 1048840, 1207765, 3021240, 3490050
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OFFSET
1,9
LINKS
Table of n, a(n) for n=1..34.
CROSSREFS
Sequence in context:
A152118
A041056
A042643
*
A166023
A137762
A177118
Adjacent sequences:
A047176
A047177
A047178
*
A047180
A047181
A047182
KEYWORD
nonn
AUTHOR
Clark Kimberling
STATUS
approved
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Last modified September 4 08:26 EDT 2024. Contains 375679 sequences. (Running on oeis4.)