[go: up one dir, main page]
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A079241 Number of isomorphism classes of associative non-commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n. 8
0, 0, 0, 10, 127, 1588, 26487, 1610379, 3683808608 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
Table of n, a(n) for n=0..8.
Index entries for sequences related to semigroups
FORMULA
A079231(n) + A079233(n) + A079235(n) + A079237(n) + A079196(n) + a(n) + A079243(n) + A079245(n) + A063524(n) = A002489(n).
a(n) = A027851(n) - A001426(n) - A079243(n). - Andrew Howroyd, Jan 27 2022
CROSSREFS
Row sums of A079207.
Cf. A079240 (labeled case), A079231, A079233, A079235, A079237, A079196, A079243, A079245, A063524.
Sequence in context: A002458 A366234 A192600 * A270965 A245923 A218474
Adjacent sequences: A079238 A079239 A079240 * A079242 A079243 A079244
KEYWORD
nonn,more
AUTHOR
Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003
EXTENSIONS
a(0)=0 prepended and a(5)-a(8) added by Andrew Howroyd, Jan 27 2022
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 29 15:03 EDT 2024. Contains 375517 sequences. (Running on oeis4.)