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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A058158 Triangle: Labeled monoids of order n with k idempotents with a fixed identity. 2
1, 1, 1, 1, 6, 4, 4, 45, 72, 35, 6, 528, 1308, 1676, 604, 80, 19935, 39700, 70170, 62060, 16727, 120, 3599436, 1969470, 3829000, 5167800, 3260382, 681232, 2760 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..29.

Index entries for sequences related to monoids

EXAMPLE

1; 1,1; 1,6,4; 4,45,72,35; 6,528,1308,1676,604; ...

CROSSREFS

a(n, k)=A058157(n, k)/n. Row sums give A058154. Column 1: A058163.

Sequence in context: A209273 A019174 A019166 * A249185 A021159 A106332

Adjacent sequences:  A058155 A058156 A058157 * A058159 A058160 A058161

KEYWORD

nonn,tabl,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 | 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 October 23 20:48 EDT 2018. Contains 316530 sequences. (Running on oeis4.)