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Search: id:A048047
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A048047 Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n+1)/3. +0
1
0, 0, 0, 0, 0, 0, 2, 3, 18, 63, 84, 224, 504, 630, 1270, 2420, 2937, 5742, 12012, 15015, 35035, 84119, 108164, 260064, 601664, 767244, 1720944, 3755844, 4738410, 10329750, 22591800, 28583709, 64071194, 144780009, 184657869 (list; graph; listen)
OFFSET

1,7
CROSSREFS

Sequence in context: A137784 A053195 A003693 this_sequence A114165 A166510 A076016

Adjacent sequences: A048044 A048045 A048046 this_sequence A048048 A048049 A048050

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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