|
|
A090603
|
|
Number of n-element labeled groupoids with a fixed identity.
|
|
2
|
|
|
1, 2, 81, 262144, 152587890625, 28430288029929701376, 2651730845859653471779023381601, 178405961588244985132285746181186892047843328, 11790184577738583171520872861412518665678211592275841109096961
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
Also labeled partial groupoids with n-1 elements.
|
|
LINKS
|
Eric Weisstein's World of Mathematics, Groupoid.
|
|
FORMULA
|
|
|
MATHEMATICA
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|