A048075 Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n+2)/3.

0, 0, 0, 0, 0, 0, 4, 5, 6, 24, 28, 32, 80, 90, 100, 245, 275, 306, 882, 1001, 1127, 3332, 3780, 4256, 11984, 13532, 15180, 42450, 47880, 53700, 153780, 173635, 195052, 564399, 637307, 716210, 2065778, 2330900, 2618486, 7551089

Offset

1,7

Links

Table of n, a(n) for n=1..40.

Crossrefs

Sequence in context: A103518 A103313 A036492 * A048016 A287648 A081406

Adjacent sequences: A048072 A048073 A048074 * A048076 A048077 A048078

Keyword

nonn

Author

Clark Kimberling

Status

approved