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A134201
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Number of rigid hypergroups of order n.
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1
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1, 2, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| R. Bayon and N. Lygeros, Hyperstructures and Automorphism Groups, submitted.
F. Marty. Sur une generalisation de la notion de groupe. In Proc. 8th Congr. des Mathematiciens Scandinaves, Stockholm, pp. 45-49, 1934.
Th. Vougiouklis, The fundamental relation in hyperrings: The general hyperfield, Fourth Int. Congress Algebraic Hyperstructures and Appl. (AHA), 1991, pp. 203-211.
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FORMULA
| a(1)=1, a(2)=2, a(n)=6 for n>2.
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CROSSREFS
| Cf. A108089, A132590, A134202.
Sequence in context: A097466 A141624 A134413 * A184408 A184409 A137479
Adjacent sequences: A134198 A134199 A134200 * A134202 A134203 A134204
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KEYWORD
| nonn
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AUTHOR
| Roman Bayon (roman.bayon(AT)gmail.com), Oct 14 2007
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