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Search: id:A079200
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| A079200 |
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Number of isomorphism classes of associative non-commutative closed binary operations on a set of order n, listed by class size. |
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+0
6
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| 0, 2, 0, 2, 0, 4, 6, 2, 0, 0, 4, 5, 0, 46, 73
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A079194(n)+A079197(n)+A079200(n)+A079201(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; 2,0; 2,0,4,6; 2,0,0,4,5,0,46,73
A079198(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 A079199(x).
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LINKS
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C. van den Bosch, Closed binary operations on small sets
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CROSSREFS
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Cf. A079194, A079197, A079198, A079199, A079201.
Sequence in context: A029186 A072680 A067770 this_sequence A011420 A035686 A037228
Adjacent sequences: A079197 A079198 A079199 this_sequence A079201 A079202 A079203
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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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