OFFSET
0,3
COMMENTS
Also labeled groupoids with an absorbant (zero) element.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..20
Eric Postpischil Posting to sci.math newsgroup, May 21 1990
Eric Weisstein's World of Mathematics, Groupoid
Wikipedia, Magma (algebra)
FORMULA
a(n) = n^((n-1)^2+1).
a(n) = A090603(n)*n.
PROG
(PARI) a(n) = n^((n-1)^2+1) \\ Andrew Howroyd, Jan 23 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Christian G. Bower, Dec 05 2003
EXTENSIONS
a(0)=0 prepended and a(9) added by Andrew Howroyd, Jan 23 2022
STATUS
approved