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A079179 Number of anti-associative closed binary operations on a set of order n. 7
1, 2, 52, 421560 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A079176(n)+A079179(n)=A002489(n).

Each a(n) is equal to the sum of the products of each element in row n of A079181 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. A079176, A079180, A079181.

Sequence in context: A080973 A230882 A216354 * A000654 A061306 A249656

Adjacent sequences:  A079176 A079177 A079178 * A079180 A079181 A079182

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified November 13 20:57 EST 2019. Contains 329106 sequences. (Running on oeis4.)