|
|
A079186
|
|
Number of non-anti-commutative closed binary operations on a set of order n.
|
|
5
|
|
|
0, 0, 8, 13851, 3530555392, 266023223876953125, 9644962193498535546171949056, 246832875573638552740275218239438131202951, 6127827569844832702316847785612357470342156990019367075840, 193794664362053647720926884692597177807303542565053791345764052714030485961865
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,3
|
|
LINKS
|
|
|
FORMULA
|
a(n) = n^(n^2) - (n^n)*((n^2-n)^((n^2-n)/2)).
|
|
PROG
|
(PARI) a(n) = n^(n^2) - (n^n)*((n^2-n)^((n^2-n)/2)) \\ Andrew Howroyd, Jan 23 2022
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003
|
|
EXTENSIONS
|
a(0)=0 prepended and terms a(5) and beyond from Andrew Howroyd, Jan 23 2022
|
|
STATUS
|
approved
|
|
|
|