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 A166933 #10 Nov 24 2016 10:25:02
%S A166933 1,10,90,810,7290,65610,590490,5314410,47829690,430467210,3874204890,
%T A166933 34867844010,313810596090,2824295364765,25418658282480,
%U A166933 228767924538720,2058911320816080,18530201887053120,166771816980853680
%N A166933 Number of reduced words of length n in Coxeter group on 10 generators S_i with relations (S_i)^2 = (S_i S_j)^13 = I.
%C A166933 The initial terms coincide with those of A003952, although the two sequences are eventually different.
%C A166933 Computed with MAGMA using commands similar to those used to compute A154638.
%H A166933 G. C. Greubel, <a href="/A166933/b166933.txt">Table of n, a(n) for n = 0..500</a>
%H A166933 <a href="/index/Rec#order_13">Index entries for linear recurrences with constant coefficients</a>, signature (8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, -36).
%F A166933 G.f.: (t^13 + 2*t^12 + 2*t^11 + 2*t^10 + 2*t^9 + 2*t^8 + 2*t^7 + 2*t^6 + 2*t^5 + 2*t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(36*t^13 - 8*t^12 - 8*t^11 - 8*t^10 - 8*t^9 - 8*t^8 - 8*t^7 - 8*t^6 - 8*t^5 - 8*t^4 - 8*t^3 - 8*t^2 - 8*t + 1).
%t A166933 CoefficientList[Series[(t^13 + 2*t^12 + 2*t^11 + 2*t^10 + 2*t^9 + 2*t^8 + 2*t^7 + 2*t^6 + 2*t^5 + 2*t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(36*t^13 - 8*t^12 - 8*t^11 - 8*t^10 - 8*t^9 - 8*t^8 - 8*t^7 - 8*t^6 - 8*t^5 - 8*t^4 - 8*t^3 - 8*t^2 - 8*t + 1), {t, 0, 50}], t] (* _G. C. Greubel_, May 28 2016 *)
%K A166933 nonn
%O A166933 0,2
%A A166933 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009