login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A047180 Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-1)/2. 0

%I #5 Mar 30 2012 18:56:53

%S 0,0,0,0,0,0,0,3,4,24,30,105,126,336,392,882,1008,2044,2304,4554,5115,

%T 10890,12342,29887,34320,90090,104104,273559,315679,795704,913640,

%U 2196740,2508928,5845008

%N Number of nonempty subsets of {1,2,...,n} in which exactly 1/6 of the elements are <= (n-1)/2.

%K nonn

%O 1,8

%A _Clark Kimberling_

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 29 17:25 EDT 2024. Contains 374734 sequences. (Running on oeis4.)