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 A163084 #12 Nov 23 2016 15:39:13
%S A163084 1,13,156,1872,22386,267696,3201198,38280528,457766166,5474058876,
%T A163084 65459882202,782782264836,9360665698098,111936698410680,
%U A163084 1338561257884422,16006781212446024,191412266920077918,2288945881199387124,27371669179630649874,327315853045229826492
%N A163084 Number of reduced words of length n in Coxeter group on 13 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.
%C A163084 The initial terms coincide with those of A170732, although the two sequences are eventually different.
%C A163084 Computed with MAGMA using commands similar to those used to compute A154638.
%H A163084 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (11, 11, 11, -66).
%F A163084 G.f.: (t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(66*t^4 - 11*t^3 - 11*t^2 - 11*t + 1).
%t A163084 CoefficientList[Series[(t^4+2t^3+2t^2+2t+1)/(66t^4-11t^3-11t^2- 11t+1), {t,0,30}],t] (* _Harvey P. Dale_, Jun 19 2011 *)
%K A163084 nonn
%O A163084 0,2
%A A163084 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009
%E A163084 More terms from _Harvey P. Dale_, Jun 19 2011