A048068 Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n-4)/2.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 9, 45, 50, 150, 165, 385, 420, 906, 988, 2340, 2583, 7035, 7875, 22275, 25080, 67880, 76415, 196027, 220389, 551733, 620711

Offset

1,12

Links

Table of n, a(n) for n=1..33.

Crossrefs

Sequence in context: A222354 A041933 A041138 * A037957 A165239 A103315

Adjacent sequences: A048065 A048066 A048067 * A048069 A048070 A048071

Keyword

nonn

Author

Clark Kimberling

Status

approved