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A037290
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Number of self-converse rings (isomorphic to inverse) with n elements.
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0
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1, 2, 2, 9, 2, 4, 2, 40, 9, 4, 2, 18, 2, 4, 4, 242, 2, 18, 2, 18, 4, 4, 2, 80, 9, 4, 47, 18, 2, 8, 2
(list;
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history;
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..31.
Christof Noebauer, Home page [broken link]
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CROSSREFS
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Cf. A027623, A037289.
Sequence in context: A082838 A074961 A037289 * A155936 A167594 A108462
Adjacent sequences: A037287 A037288 A037289 * A037291 A037292 A037293
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KEYWORD
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nonn,hard,mult,nice
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AUTHOR
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Christian G. Bower, Jun 15 1998.
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EXTENSIONS
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a(16) and a(27) from Christof Noebauer (christof.noebauer(AT)algebra.uni-linz.ac.at), Oct 17, 2000.
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STATUS
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approved
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