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 A162937 #5 Nov 23 2016 15:37:09 %S A162937 1,6,30,150,735,3600,17640,86400,423210,2073000,10154040,49737000, %T A162937 243624060,1193330400,5845225440,28631349600,140243381160, %U A162937 686946520800,3364832751840,16481777119200,80731791755760,395444141299200 %N A162937 Number of reduced words of length n in Coxeter group on 6 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I. %C A162937 The initial terms coincide with those of A003948, although the two sequences are eventually different. %C A162937 Computed with MAGMA using commands similar to those used to compute A154638. %H A162937 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4, 4, 4, -10). %F A162937 G.f.: (t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(10*t^4 - 4*t^3 - 4*t^2 - 4*t + 1) %K A162937 nonn %O A162937 0,2 %A A162937 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009