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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A058148 Monoids of order n with 2 idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator). 1
1, 3, 9, 30, 175, 3333 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..7.

Index entries for sequences related to monoids

CROSSREFS

Column 2 of A058147.

Sequence in context: A120018 A091353 A003604 * A031031 A034550 A018370

Adjacent sequences:  A058145 A058146 A058147 * A058149 A058150 A058151

KEYWORD

nonn,more

AUTHOR

Christian G. Bower, Nov 14 2000

STATUS

approved

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

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

Last modified November 28 04:34 EST 2014. Contains 250286 sequences.