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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A058130 Number of asymmetric monoids (semigroups with identity) of order n. 3
1, 2, 4, 19, 128, 1344, 20997, 1479686 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

Index entries for sequences related to monoids

CROSSREFS

a(n)=A058136(n)*2-A058135(n).

Sequence in context: A272988 A168246 A212923 * A191563 A046082 A048774

Adjacent sequences:  A058127 A058128 A058129 * A058131 A058132 A058133

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower, Nov 13 2000

EXTENSIONS

a(8) from Christian G. Bower, Dec 26 2006

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 November 14 15:16 EST 2018. Contains 317208 sequences. (Running on oeis4.)