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Search: id:A079203
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| A079203 |
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Number of isomorphism classes of non-associative non-commutative non-anti-associative 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, 2, 0, 6, 34, 952, 0, 1, 12, 6, 181, 283, 13333, 31839187
(list; graph; listen)
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OFFSET
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1,3
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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; 0,2; 0,6,34,952; 0,1,12,6,181,283,13333,31839187
A079232(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 A079233(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 groupoids
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CROSSREFS
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Cf. A079202, A079204, A079205, A079197, A079207, A079208, A079209, A079232, A079233.
Sequence in context: A078048 A110667 A129877 this_sequence A151751 A021487 A142709
Adjacent sequences: A079200 A079201 A079202 this_sequence A079204 A079205 A079206
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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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