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 A167897 #10 Nov 24 2016 12:34:01
%S A167897 1,6,30,150,750,3750,18750,93750,468750,2343750,11718750,58593750,
%T A167897 292968750,1464843750,7324218750,36621093750,183105468735,
%U A167897 915527343600,4577636717640,22888183586400,114440917923000,572204589570000
%N A167897 Number of reduced words of length n in Coxeter group on 6 generators S_i with relations (S_i)^2 = (S_i S_j)^16 = I.
%C A167897 The initial terms coincide with those of A003948, although the two sequences are eventually different.
%C A167897 Computed with MAGMA using commands similar to those used to compute A154638.
%H A167897 G. C. Greubel, <a href="/A167897/b167897.txt">Table of n, a(n) for n = 0..500</a>
%H A167897 <a href="/index/Rec#order_16">Index entries for linear recurrences with constant coefficients</a>, signature (4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, -10).
%F A167897 G.f.: (t^16 + 2*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)/( 10*t^16 - 4*t^15 - 4*t^14 - 4*t^13 - 4*t^12 - 4*t^11 - 4*t^10 - 4*t^9 - 4*t^8 - 4*t^7 - 4*t^6 - 4*t^5 - 4*t^4 - 4*t^3 - 4*t^2 - 4*t + 1).
%t A167897 CoefficientList[Series[(t^16 + 2*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)/(10*t^16 - 4*t^15 - 4*t^14 - 4*t^13 - 4*t^12 - 4*t^11 - 4*t^10 - 4*t^9 - 4*t^8 - 4*t^7 - 4*t^6 - 4*t^5 - 4*t^4 - 4*t^3 - 4*t^2 - 4*t + 1), {t, 0, 50}], t] (* _G. C. Greubel_, Jul 01 2016 *)
%K A167897 nonn
%O A167897 0,2
%A A167897 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009