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Search: id:A079207
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| A079207 |
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Number of isomorphism classes of associative non-commutative non-anti-associative non-anti-commutative closed binary operations on a set of order n, listed by class size. |
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+0
9
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| 0, 0, 0, 0, 0, 4, 6, 0, 0, 0, 4, 4, 0, 46, 73
(list; graph; listen)
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OFFSET
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1,6
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COMMENT
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A079202(n)+A079203(n)+A079204(n)+A079205(n)+A079197(n)+A079207(n)+A079208(n)+A079209(n)+A063524(n)=A079171(n)
Elements per row: 1,2,4,8,16,30,... (given by A027423, number of positive divisors of n!)
First four rows: 0; 0,0; 0,0,4,6; 0,0,0,4,4,0,46,73
A079240(x) is equal to the sum of the products of each element in row x of this sequence and the corresponding element of A079210.
The sum of each row x of this sequence is given by A079241(x).
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LINKS
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C. van den Bosch, Closed binary operations on small sets
Index entries for sequences related to semigroups
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CROSSREFS
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Cf. A079202, A079203, A079204, A079205, A079197, A079208, A079209, A079240, A079241.
Sequence in context: A058916 A064612 A005927 this_sequence A056945 A070683 A106145
Adjacent sequences: A079204 A079205 A079206 this_sequence A079208 A079209 A079210
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KEYWORD
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nonn,tabf
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AUTHOR
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Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003
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