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A029851
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Number of self-converse semigroups of order n.
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7
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OFFSET
| 0,3
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LINKS
| Andreas Distler, Classification and Enumeration of Finite Semigroups, A Thesis Submitted for the Degree of PhD, University of St Andrews (2010).
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to semigroups
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CROSSREFS
| a(n)=A001423(n)*2-A027851(n). Cf. A001426.
Sequence in context: A203508 A052757 A206226 * A201720 A196559 A111262
Adjacent sequences: A029848 A029849 A029850 * A029852 A029853 A029854
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KEYWORD
| nonn,hard,more,nice
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AUTHOR
| Christian G. Bower (bowerc(AT)usa.net), Jan 27 1998. Updated Feb 19 2001
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EXTENSIONS
| a(8) and a(9) from Andreas Distler (andreas(AT)mcs.st-andrews.ac.uk), Jan 17 2011
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