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A001424
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Number of nonisomorphic and nonantiisomorphic groupoids with n elements.
(Formerly M4465 N1894)
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4
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OFFSET
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0,3
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REFERENCES
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N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
T. Tamura, Some contributions of computation to semigroups and groupoids, pp. 229-261 of J. Leech, editor, Computational Problems in Abstract Algebra. Pergamon, Oxford, 1970.
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LINKS
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Eric Weisstein's World of Mathematics, Groupoid.
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Better description and corrected 4th term from Christian G. Bower, Jan 15 1998. More terms, Jun 15 1998.
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STATUS
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approved
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