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A079199 Number of isomorphism classes of associative non-commutative closed binary operations on a set of order n. +0
10
0, 2, 12, 130 (list; graph; listen)
OFFSET

1,2

COMMENT

A079193(n)+A079196(n)+A079199(n)+A001426(n)=A001329(n).

Each a(n) is equal to the sum of the elements in row n of A079200.

LINKS

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

Index entries for sequences related to semigroups

CROSSREFS

Cf. A001426, A079193, A079196, A079198, A079200.

Sequence in context: A014235 A098628 A123553 this_sequence A090361 A073551 A132472

Adjacent sequences: A079196 A079197 A079198 this_sequence A079200 A079201 A079202

KEYWORD

nonn

AUTHOR

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

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Last modified November 23 10:40 EST 2009. Contains 167421 sequences.


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