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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A079195 Number of non-associative commutative closed binary operations on a set of order n. 14
0, 2, 666, 1047436 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

A079192(n)+A079195(n)+A079198(n)+A023815(n)=A002489(n).

Each a(n) is equal to the sum of the products of each element in row n of A079197 and the corresponding element of A079210.

LINKS

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

Index entries for sequences related to groupoids

CROSSREFS

Cf. A023815, A079192, A079196, A079197, A079198.

Sequence in context: A134796 A120830 A156938 * A120123 A140014 A188698

Adjacent sequences:  A079192 A079193 A079194 * A079196 A079197 A079198

KEYWORD

nonn

AUTHOR

Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003

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

Content is available under The OEIS End-User License Agreement .

Last modified February 15 23:21 EST 2012. Contains 205860 sequences.