login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A048012 Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n-1)/3. 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 21, 28, 36, 144, 180, 220, 550, 660, 780, 2275, 2821, 3465, 13230, 16940, 21420, 74256, 94248, 118104, 367080, 461700, 574644, 1824690, 2310000, 2899380, 9684840, 12357532, 15634300, 51798175, 66098175 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

LINKS

Table of n, a(n) for n=1..38.

CROSSREFS

Sequence in context: A009727 A168105 A227936 * A254368 A276674 A130202

Adjacent sequences:  A048009 A048010 A048011 * A048013 A048014 A048015

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy .

Last modified September 23 17:50 EDT 2017. Contains 292363 sequences.