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A048090
Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n+3)/3.
0
0, 0, 0, 0, 0, 0, 0, 0, 5, 6, 7, 35, 40, 45, 135, 150, 165, 385, 420, 455, 988, 1071, 1155, 2835, 3096, 3366, 9690, 10665, 11685, 34485, 37950, 41580, 115675, 126775, 138391, 365079, 398684, 433875, 1135225, 1238601, 1347255, 3626415
OFFSET
1,9
CROSSREFS
Sequence in context: A272676 A066876 A048042 * A048027 A294071 A240661
KEYWORD
nonn
STATUS
approved