%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