The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A079183 Number of isomorphism classes of non-commutative closed binary operations (groupoids) on a set of order n. 4
0, 6, 3201, 178937984, 2483527282664925, 14325590003288422852104768, 50976900301814583996024242298024434780, 155682086691137947272042494203068030678979503481450216 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
A001425(n)+a(n)=A001329(n).
Each a(n) is equal to the sum of the elements in row n of A079184.
LINKS
CROSSREFS
Sequence in context: A093884 A265869 A274083 * A373236 A030245 A247965
KEYWORD
nonn
AUTHOR
Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003
EXTENSIONS
Edited and extended by Christian G. Bower, Dec 12 2003
STATUS
approved

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 June 16 15:45 EDT 2024. Contains 373432 sequences. (Running on oeis4.)