|
| |
|
|
A058170
|
|
Triangle: Number of asymmetric semigroups of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
|
|
0
| |
|
|
1, 2, 1, 3, 7, 2, 10, 28, 33, 7, 82, 153, 261, 213, 37, 2511, 1227, 2266, 2989, 1709, 263, 600106, 26033, 24176, 39176, 38346, 16306, 2134
(list; table; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
LINKS
| Index entries for sequences related to semigroups
|
|
|
EXAMPLE
| 1; 2,1; 3,7,2; 10,28,33,7; 82,153,261,213,37; ...
|
|
|
CROSSREFS
| Row sums give A058107.
Sequence in context: A116381 A073901 A176120 * A127896 A010757 A019320
Adjacent sequences: A058167 A058168 A058169 * A058171 A058172 A058173
|
|
|
KEYWORD
| nonn,tabl,hard
|
|
|
AUTHOR
| Christian G. Bower (bowerc(AT)usa.net), Nov 19 2000
|
| |
|
|
