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Search: id:A134202
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| A134202 |
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Number of rigid Hv-groups of order n. |
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+0
2
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| 1, 5, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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R. Bayon and N. Lygeros, Hyperstructures and Automorphism Groups, submitted.
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
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a(1)=1, a(2)=5, a(3)=13, a(n)=14 for n>3
G.f.: -x*(1+4*x+8*x^2+x^3)/(-1+x). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
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CROSSREFS
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Cf. A108089, A132590, A134201.
Sequence in context: A051899 A085956 A151994 this_sequence A020996 A090759 A090758
Adjacent sequences: A134199 A134200 A134201 this_sequence A134203 A134204 A134205
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KEYWORD
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nonn
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AUTHOR
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Roman Bayon (roman.bayon(AT)gmail.com), Oct 14 2007
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