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 A167815 #9 Nov 24 2016 11:11:27
%S A167815 1,36,1260,44100,1543500,54022500,1890787500,66177562500,
%T A167815 2316214687500,81067514062500,2837362992187500,99307704726562500,
%U A167815 3475769665429687500,121651938290039062500,4257817840151367187500,149023624405297851561870
%N A167815 Number of reduced words of length n in Coxeter group on 36 generators S_i with relations (S_i)^2 = (S_i S_j)^15 = I.
%C A167815 The initial terms coincide with those of A170755, although the two sequences are eventually different.
%C A167815 Computed with MAGMA using commands similar to those used to compute A154638.
%H A167815 G. C. Greubel, <a href="/A167815/b167815.txt">Table of n, a(n) for n = 0..500</a>
%H A167815 <a href="/index/Rec#order_15">Index entries for linear recurrences with constant coefficients</a>, signature (34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, 34, -595).
%F A167815 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)/(595*t^15 - 34*t^14 - 34*t^13 - 34*t^12 - 34*t^11 - 34*t^10 - 34*t^9 - 34*t^8 - 34*t^7 - 34*t^6 - 34*t^5 - 34*t^4 - 34*t^3 - 34*t^2 - 34*t + 1).
%t A167815 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)/(595*t^15 - 34*t^14 - 34*t^13 - 34*t^12 - 34*t^11 - 34*t^10 - 34*t^9 - 34*t^8 - 34*t^7 - 34*t^6 - 34*t^5 - 34*t^4 - 34*t^3 - 34*t^2 - 34*t + 1), {t, 0, 50}], t] (* _G. C. Greubel_, Jun 27 2016 *)
%K A167815 nonn
%O A167815 0,2
%A A167815 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009