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A048033
Number of nonempty subsets of {1,2,...,n} in which exactly 2/5 of the elements are <= (n-3)/3.
0
0, 0, 0, 0, 0, 0, 0, 0, 35, 56, 84, 252, 360, 495, 1452, 2244, 3432, 11440, 18655, 29575, 86905, 139960, 220150, 617610, 1007216, 1616615, 4563344, 7573970, 12359690, 34220634, 57059772, 93595740, 254222289, 425926604, 703601510
OFFSET
1,9
CROSSREFS
Sequence in context: A176255 A355814 A090877 * A254366 A242291 A078819
KEYWORD
nonn
STATUS
approved