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A048018
Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= (n-2)/3.
0
0, 0, 0, 0, 0, 0, 0, 6, 7, 8, 24, 27, 30, 105, 121, 138, 450, 520, 595, 1939, 2255, 2600, 8456, 9877, 11445, 37122, 43510, 50625, 164025, 192801, 225093, 728409, 858199, 1004754, 3248322, 3834655, 4500210, 14536951, 17189667
OFFSET
1,8
CROSSREFS
Sequence in context: A358557 A112813 A347808 * A254714 A047197 A048079
KEYWORD
nonn
STATUS
approved