A048064 Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-4)/2.

0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 8, 32, 36, 90, 100, 245, 275, 770, 882, 2520, 2912, 7930, 9184, 24430, 28400, 76010, 88880, 239420, 281384, 755378, 890916, 2378103, 2813083

Offset

1,10

Links

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

Crossrefs

Sequence in context: A271901 A042875 A154745 * A122605 A037953 A296636

Adjacent sequences: A048061 A048062 A048063 * A048065 A048066 A048067

Keyword

nonn

Author

Clark Kimberling

Status

approved