The On-Line Encyclopedia of Integer Sequences (OEIS)

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Number of quasigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).
(history; published version)

#6 by Russ Cox at Fri Mar 30 17:37:12 EDT 2012

AUTHOR

_Christian G. Bower (bowerc(AT)usa.net), _, Nov 20 2000

Discussion

Fri Mar 30

17:37

OEIS Server: https://oeis.org/edit/global/178

#5 by Russ Cox at Sun Jul 10 18:37:13 EDT 2011

LINKS

<a href="/Sindx_index/Qua.html#quasigroups">Index entries for sequences related to quasigroups</a>

Discussion

Sun Jul 10

18:37

OEIS Server: https://oeis.org/edit/global/75

#4 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010

LINKS

<a href="/Sindx_Qua.html#quasigroups">Index entries for sequences related to quasigroups</a>

KEYWORD

nonn,more,new

#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

LINKS

<a href="http://www.research.att.com/~njas/sequences/Sindx_Qua.html#quasigroups">Index entries for sequences related to quasigroups</a>

KEYWORD

nonn,more,new

#2 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004

NAME

Quasigroups Number of quasigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

KEYWORD

nonn,more,new

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

Quasigroups of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

DATA

1, 1, 1, 4, 24, 746, 567207

OFFSET

0,4

LINKS

<a href="http://www.research.att.com/~njas/sequences/Sindx_Qua.html#quasigroups">Index entries for sequences related to quasigroups</a>

CROSSREFS

a(n)=(A057991(n)+A057993)/2.

KEYWORD

nonn,more

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Nov 20 2000

STATUS

approved