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A079184
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Number of isomorphism classes of non-commutative closed binary operations on a set of order n, listed by class size.
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4
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0, 4, 2, 2, 8, 70, 3121, 2, 1, 14, 22, 275, 467, 48306, 178888897
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OFFSET
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1,2
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COMMENTS
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Elements per row: 1,2,4,8,16,30,... (given by A027423, number of positive divisors of n!)
First four rows: 0; 4,2; 2,8,70,3121; 2,1,14,22,275,467,48306,178888897
A079176(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 n is given by A079177(n).
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LINKS
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CROSSREFS
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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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STATUS
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approved
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