login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A048023 Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n-2)/3. 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 36, 45, 180, 220, 264, 660, 780, 910, 2821, 3465, 4220, 16940, 21420, 26775, 94248, 118104, 146300, 461700, 574644, 708477, 2310000, 2899380, 3610540, 12357532, 15634300, 19623175, 66098175 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

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

CROSSREFS

Sequence in context: A303261 A168106 A061900 * A105710 A192226 A323005

Adjacent sequences:  A048020 A048021 A048022 * A048024 A048025 A048026

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 5 09:06 EDT 2020. Contains 334829 sequences. (Running on oeis4.)