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A047195
Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= n/3.
0
0, 0, 0, 0, 0, 4, 5, 6, 18, 21, 24, 76, 90, 105, 325, 385, 450, 1390, 1651, 1939, 6027, 7175, 8456, 26348, 31416, 37122, 116010, 138510, 164025, 513729, 614019, 728409, 2285569, 2734171, 3248322, 10208110, 12220780, 14536951
OFFSET
1,6
CROSSREFS
Sequence in context: A235711 A010753 A221174 * A109889 A103518 A103313
KEYWORD
nonn
STATUS
approved