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A079192 Number of non-associative non-commutative closed binary operations on a set of order n. 7
0, 6, 18904, 4293916368 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A079192(n)+A079195(n)+A079198(n)+A023815(n)=A002489(n).

Each a(n) is equal to the sum of the products of each element in row n of A079194 and the corresponding element of A079210.

LINKS

Table of n, a(n) for n=1..4.

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

Index entries for sequences related to groupoids

CROSSREFS

Cf. A079193, A079194, A079195, A079198, A023815.

Sequence in context: A130434 A121571 A123659 * A278369 A283886 A278653

Adjacent sequences:  A079189 A079190 A079191 * A079193 A079194 A079195

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified July 22 00:13 EDT 2017. Contains 289648 sequences.