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Search: id:A079202
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| A079202 |
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Number of isomorphism classes of non-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, 32, 2155, 0, 0, 0, 12, 60, 184, 34544, 147032271
(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; 0,0,32,2155; 0,0,0,12,60,184,34544,147032271
A079230(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 A079231(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. A079203, A079204, A079205, A079197, A079207, A079208, A079209, A079230, A079231.
Sequence in context: A122123 A013994 A159364 this_sequence A085526 A101441 A077143
Adjacent sequences: A079199 A079200 A079201 this_sequence A079203 A079204 A079205
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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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