|
|
A079196
|
|
Number of isomorphism classes of non-associative commutative closed binary operations on a set of order n.
|
|
15
|
|
|
0, 0, 1, 117, 43910, 254429575, 30468670168769, 91267244789189717968, 8048575431238519331999349995, 24051927835861852500932966021639447717, 2755731922430783367615449408031031255128360423993
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,4
|
|
LINKS
|
|
|
FORMULA
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|