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 A167650 #10 Nov 24 2016 11:01:17
%S A167650 1,5,20,80,320,1280,5120,20480,81920,327680,1310720,5242880,20971520,
%T A167650 83886080,335544320,1342177270,5368709040,21474836010,85899343440,
%U A167650 343597371360,1374389475840,5497557864960,21990231306240,87960924610560
%N A167650 Number of reduced words of length n in Coxeter group on 5 generators S_i with relations (S_i)^2 = (S_i S_j)^15 = I.
%C A167650 The initial terms coincide with those of A003947, although the two sequences are eventually different.
%C A167650 Computed with MAGMA using commands similar to those used to compute A154638.
%H A167650 G. C. Greubel, <a href="/A167650/b167650.txt">Table of n, a(n) for n = 0..500</a>
%H A167650 <a href="/index/Rec#order_15">Index entries for linear recurrences with constant coefficients</a>, signature (3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, -6).
%F A167650 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)/(6*t^15 - 3*t^14 - 3*t^13 - 3*t^12 - 3*t^11 - 3*t^10 - 3*t^9 - 3*t^8 - 3*t^7 - 3*t^6 - 3*t^5 - 3*t^4 - 3*t^3 - 3*t^2 - 3*t + 1).
%t A167650 CoefficientList[Series[(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)/(6*t^15 - 3*t^14 - 3*t^13 - 3*t^12 - 3*t^11 - 3*t^10 - 3*t^9 - 3*t^8 - 3*t^7 - 3*t^6 - 3*t^5 - 3*t^4 - 3*t^3 - 3*t^2 - 3*t + 1), {t, 0, 50}], t] (* _G. C. Greubel_, Jun 18 2016 *)
%K A167650 nonn
%O A167650 0,2
%A A167650 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009