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A048001 Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= n/3. +0
1
0, 0, 0, 0, 0, 0, 2, 12, 18, 63, 168, 224, 504, 1014, 1270, 2420, 4620, 5742, 12012, 27027, 35035, 84119, 199304, 260064, 601664, 1339464, 1720944, 3755844, 8093214, 10329750, 22591800, 49876200, 64071194, 144780009 (list; graph; listen)
OFFSET

1,7
CROSSREFS

Adjacent sequences: A047998 A047999 A048000 this_sequence A048002 A048003 A048004

Sequence in context: A066238 A101074 A115109 this_sequence A109299 A073257 A011532

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified May 22 15:55 EDT 2008. Contains 140006 sequences.

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