The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A079241

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A079241

Number of isomorphism classes of associative non-commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n.
(history; published version)

#13 by Michael De Vlieger at Thu Jan 27 15:42:09 EST 2022

STATUS

proposed

approved

#12 by Andrew Howroyd at Thu Jan 27 14:33:39 EST 2022

STATUS

editing

proposed

#11 by Andrew Howroyd at Thu Jan 27 14:28:31 EST 2022

FORMULA

a(n) = A027851(n) - A001426(n) - A079243(n). - Andrew Howroyd, Jan 27 2022

#10 by Andrew Howroyd at Thu Jan 27 14:03:18 EST 2022

DATA

0, 0, 0, 10, 127, 1588, 26487, 1610379, 3683808608

OFFSET

1,3

0,4

COMMENTS

A079231(n)+A079233(n)+A079235(n)+A079237(n)+A079196(n)+A079241(n)+A079243(n)+A079245(n)+A063524(n)=A002489(n)

Each a(n) is equal to the sum of the elements in row n of A079207.

FORMULA

A079231(n) + A079233(n) + A079235(n) + A079237(n) + A079196(n) + a(n) + A079243(n) + A079245(n) + A063524(n) = A002489(n).

CROSSREFS

Row sums of A079207.

Cf. A079207, A079240, (labeled case), A079231, A079233, A079235, A079237, A079196, A079243, A079245, A063524.

EXTENSIONS

a(0)=0 prepended and a(5)-a(8) added by Andrew Howroyd, Jan 27 2022

STATUS

approved

editing

#9 by Charles R Greathouse IV at Tue Nov 05 02:36:25 EST 2013

STATUS

proposed

approved

#8 by Jon E. Schoenfield at Tue Nov 05 00:11:51 EST 2013

STATUS

editing

proposed

#7 by Jon E. Schoenfield at Tue Nov 05 00:11:49 EST 2013

KEYWORD

nonn,bref,more

STATUS

approved

editing

#6 by Russ Cox at Sun Jul 10 18:22:18 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

#5 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,bref,more,new

#4 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,bref,more,new