This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A162811 #7 Sep 10 2021 19:19:25
%S A162811 1,25,600,14100,331200,7776300,182580900,4286804400,100649603100,
%T A162811 2363145044100,55484118871200,1302707779596300,30586185632580900,
%U A162811 718130931671624400,16860946350828143100,395876990262902324100
%N A162811 Number of reduced words of length n in Coxeter group on 25 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.
%C A162811 The initial terms coincide with those of A170744, although the two sequences are eventually different.
%C A162811 Computed with MAGMA using commands similar to those used to compute A154638.
%H A162811 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (23, 23, -276).
%F A162811 G.f.: (t^3 + 2*t^2 + 2*t + 1)/(276*t^3 - 23*t^2 - 23*t + 1)
%t A162811 coxG[{3,276,-23}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Sep 10 2021 *)
%K A162811 nonn
%O A162811 0,2
%A A162811 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009