A048076 Number of nonempty subsets of {1,2,...,n} in which exactly 1/5 of the elements are <= (n+2)/3.

0, 0, 0, 0, 0, 2, 3, 15, 45, 60, 140, 286, 360, 720, 1500, 1935, 4455, 10415, 13895, 32487, 73255, 97188, 216580, 476910, 632706, 1418514, 3181482, 4259520, 9690000, 21851202, 29366007, 66481107, 149093417, 200571107

Offset

1,6

Links

Table of n, a(n) for n=1..34.

Crossrefs

Sequence in context: A298370 A221860 A216339 * A203432 A298409 A151369

Adjacent sequences: A048073 A048074 A048075 * A048077 A048078 A048079

Keyword

nonn

Author

Clark Kimberling

Status

approved