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 A167880 #13 Nov 24 2016 11:15:40
%S A167880 1,50,2450,120050,5882450,288240050,14123762450,692064360050,
%T A167880 33911153642450,1661646528480050,81420679895522450,
%U A167880 3989613314880600050,195491052429149402450,9579061569028320720050,469374016882387715282450
%N A167880 Number of reduced words of length n in Coxeter group on 50 generators S_i with relations (S_i)^2 = (S_i S_j)^15 = I.
%C A167880 The initial terms coincide with those of A170769, although the two sequences are eventually different.
%C A167880 Computed with MAGMA using commands similar to those used to compute A154638.
%H A167880 G. C. Greubel, <a href="/A167880/b167880.txt">Table of n, a(n) for n = 0..500</a>
%H A167880 <a href="/index/Rec#order_15">Index entries for linear recurrences with constant coefficients</a>, signature (48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, -1176).
%F A167880 G.f.: (t^15 + 2*t^14 + 2*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)/(1176*t^15 - 48*t^14 - 48*t^13 - 48*t^12 - 48*t^11 - 48*t^10 - 48*t^9 - 48*t^8 - 48*t^7 - 48*t^6 - 48*t^5 - 48*t^4 - 48*t^3 - 48*t^2 - 48*t + 1).
%t A167880 With[{num=Total[2t^Range[14]]+t^15+1,den=Total[-48 t^Range[14]]+ 1176t^15+1},CoefficientList[Series[num/den,{t,0,20}],t]] (* _Harvey P. Dale_, Aug 22 2011 *)
%K A167880 nonn
%O A167880 0,2
%A A167880 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009