A079244 - OEIS

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A079244

Number of associative commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n.

0, 6, 63, 1140

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OFFSET

1,2

COMMENTS

A079230(n)+A079232(n)+A079234(n)+A079236(n)+A079195(n)+A079240(n)+A079242(n)+A079244(n)+A063524(n)=A002489(n)

Each a(n) is equal to the sum of the products of each element in row n of A079209 and the corresponding element of A079210.

LINKS

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

Index entries for sequences related to semigroups

CROSSREFS

Cf. A079209, A079245, A079230, A079232, A079234, A079236, A079195, A079240, A079242, A063524.

Sequence in context: A295241 A271607 A360481 * A023815 A249590 A034665

Adjacent sequences: A079241 A079242 A079243 * A079245 A079246 A079247

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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