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A134202
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Number of rigid Hv-groups of order n.
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1
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1, 5, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14
(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.
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)=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
| Cf. A108089, A132590, A134201.
Sequence in context: A085956 A151994 A183782 * A191382 A174069 A020996
Adjacent sequences: A134199 A134200 A134201 * A134203 A134204 A134205
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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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