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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A030249 Number of nonisomorphic idempotent groupoids with a nontrivial symmetry. 0
0, 0, 2, 30, 3187 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..4.

Index entries for sequences related to groupoids

CROSSREFS

A030247 - A030248.

Sequence in context: A099929 A136636 A220719 * A000187 A053851 A077521

Adjacent sequences:  A030246 A030247 A030248 * A030250 A030251 A030252

KEYWORD

nonn,more

AUTHOR

Christian G. Bower

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 December 5 20:44 EST 2019. Contains 329778 sequences. (Running on oeis4.)