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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A079196 Number of isomorphism classes of non-associative commutative closed binary operations on a set of order n. 16
0, 1, 117, 43910 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A079193(n)+A079196(n)+A079199(n)+A001426(n)=A001329(n).

Each a(n) is equal to the sum of the elements in row n of A079197.

LINKS

Table of n, a(n) for n=1..4.

C. van den Bosch, Closed binary operations on small sets

Index entries for sequences related to groupoids

CROSSREFS

Cf. A001426, A079193, A079195, A079197, A079199.

Sequence in context: A203626 A220600 A194613 * A113798 A151593 A263425

Adjacent sequences:  A079193 A079194 A079195 * A079197 A079198 A079199

KEYWORD

nonn

AUTHOR

Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 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 | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified July 25 18:14 EDT 2017. Contains 289796 sequences.