The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A058119

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Number of self-converse semigroups of order n with 1 idempotent.
(history; published version)

#6 by Russ Cox at Fri Mar 30 17:37:11 EDT 2012

AUTHOR

_Christian G. Bower (bowerc(AT)usa.net), _, Nov 10 2000

Discussion

Fri Mar 30

17:37

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

#5 by Russ Cox at Sun Jul 10 18:22:17 EDT 2011

LINKS

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

Discussion

Sun Jul 10

18:22

OEIS Server: https://oeis.org/edit/global/81

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

LINKS

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

KEYWORD

nonn,hard,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_Se.html#semigroups">Index entries for sequences related to semigroups</a>

KEYWORD

nonn,hard,new

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

NAME

SelfNumber of self-converse semigroups of order n with 1 idempotent.

KEYWORD

nonn,hard,new

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

NAME

Self-converse semigroups of order n with 1 idempotent.

DATA

1, 2, 5, 18, 93, 930, 22899

OFFSET

1,2

LINKS

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

CROSSREFS

Column 1 of A058118.

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Nov 10 2000

STATUS

approved