The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A362823 Number of labeled magmas with n elements satisfying the identities (xy)y = x and (xy)z = (xz)y. 4
 1, 1, 4, 22, 976, 19376, 7680016, 430723168, 1489656111616, 214815786486400, 6364561150037368576, 2241692646969785651456, 566719960584895502028138496, 471612192582034433034750951424, 1008512943343839231897776246546624512, 1936475539456937172034340659334701398016 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS a(n) is the number of ordered n-tuples of involutions on [n] that pairwise commute. Two involutions x,y on [n] commute if x*y = y*x. LINKS Andrew Howroyd, Table of n, a(n) for n = 0..50 CROSSREFS Main diagonal of A362824. Cf. A362383, A362643, A362821, A362822 (isomorphism classes). Sequence in context: A321604 A276124 A104166 * A368140 A273054 A065401 Adjacent sequences: A362820 A362821 A362822 * A362824 A362825 A362826 KEYWORD nonn AUTHOR Andrew Howroyd, May 06 2023 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.

Last modified July 19 19:39 EDT 2024. Contains 374436 sequences. (Running on oeis4.)