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A079172 Number of non-associative closed binary operations on a set of order n. 5
0, 8, 19570, 4294963804, 298023223876769393, 10314424798490535546154887938, 256923577521058878088611477224227878265543 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

A023814(n)+A079172(n)=A002489(n)

Each a(n) is equal to the sum of the products of each element in row n of A079174 and the corresponding element of A079210.

LINKS

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

Index entries for sequences related to groupoids

CROSSREFS

Cf. A023814, A079173, A079174.

Sequence in context: A079597 A160743 A079182 * A173543 A067074 A067070

Adjacent sequences:  A079169 A079170 A079171 * A079173 A079174 A079175

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

More terms from Christian G. Bower (bowerc(AT)usa.net), Nov 26 2003

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Last modified February 15 13:21 EST 2012. Contains 205799 sequences.