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 A162808 #7 Mar 09 2018 19:51:16
%S A162808 1,22,462,9471,194040,3973200,81355890,1665833400,34109413800,
%T A162808 698420207100,14300767404000,292820775324000,5995762611069000,
%U A162808 122768506573020000,2513793020863740000,51472120400410710000
%N A162808 Number of reduced words of length n in Coxeter group on 22 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.
%C A162808 The initial terms coincide with those of A170741, although the two sequences are eventually different.
%C A162808 Computed with MAGMA using commands similar to those used to compute A154638.
%H A162808 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (20, 20, -210).
%F A162808 G.f.: (t^3 + 2*t^2 + 2*t + 1)/(210*t^3 - 20*t^2 - 20*t + 1)
%t A162808 coxG[{3,210,-20}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Mar 09 2018 *)
%K A162808 nonn
%O A162808 0,2
%A A162808 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009