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A079183 Number of isomorphism classes of non-commutative closed binary operations (groupoids) on a set of order n. 4
0, 6, 3201, 178937984, 2483527282664925, 14325590003288422852104768, 50976900301814583996024242298024434780, 155682086691137947272042494203068030678979503481450216 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
A001425(n)+a(n)=A001329(n).
Each a(n) is equal to the sum of the elements in row n of A079184.
LINKS
CROSSREFS
Sequence in context: A093884 A265869 A274083 * A030245 A247965 A172955
KEYWORD
nonn
AUTHOR
Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003
EXTENSIONS
Edited and extended by Christian G. Bower, Dec 12 2003
STATUS
approved

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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)