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A079187 Number of isomorphism classes of non-anti-commutative closed binary operations (groupoids) on a set of order n. 6
1, 4, 2334, 147124304, 2216860823492185, 13395780829563177947362200, 48974776899548402559651008669035131863, 151979850442580207421627199010701131897617064179661376 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

A079187(n)+A079190(n)=A001329(n).

Each a(n) is equal to the sum of the elements in row n of A079188.

LINKS

C. van den Bosch, Closed binary operations on small sets

Index entries for sequences related to groupoids

CROSSREFS

Cf. A079186, A079188, A079190.

Sequence in context: A062407 A097476 A047676 * A131587 A066850 A066837

Adjacent sequences:  A079184 A079185 A079186 * A079188 A079189 A079190

KEYWORD

nonn

AUTHOR

Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003

EXTENSIONS

Edited, corrected and extended by Christian G. Bower (bowerc(AT)usa.net), Dec 12 2003

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Last modified February 16 17:46 EST 2012. Contains 205939 sequences.