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Number of rigid Hv-groups of order n.
2

%I #13 Jun 29 2023 12:33:57

%S 1,5,13,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,

%T 14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,

%U 14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14

%N Number of rigid Hv-groups of order n.

%D R. Bayon and N. Lygeros, Hyperstructures and Automorphism Groups, submitted.

%D Th. Vougiouklis, The fundamental relation in hyperrings: The general hyperfield, Fourth Int. Congress Algebraic Hyperstructures and Appl. (AHA), 1991, pp. 203-211.

%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).

%F a(1)=1, a(2)=5, a(3)=13, a(n)=14 for n>3.

%F G.f.: -x*(1+4*x+8*x^2+x^3)/(-1+x). - _R. J. Mathar_, Nov 14 2007

%t PadRight[{1,5,13},120,{14}] (* _Harvey P. Dale_, Aug 22 2019 *)

%Y Cf. A108089, A132590, A134201.

%K nonn

%O 1,2

%A Roman Bayon (roman.bayon(AT)gmail.com), Oct 14 2007