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A079198 Number of associative non-commutative closed binary operations on a set of order n. 8
0, 2, 50, 2352 (list; graph; refs; listen; history; 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 A079200 and the corresponding element of A079210.

LINKS

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

Index entries for sequences related to semigroups

CROSSREFS

Cf. A023815, A079192, A079195, A079199, A079200.

Sequence in context: A083941 A080263 A088920 * A203766 A197487 A080293

Adjacent sequences:  A079195 A079196 A079197 * A079199 A079200 A079201

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 23:58 EST 2012. Contains 206085 sequences.