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 A162804 #5 Nov 23 2016 15:24:32 %S A162804 1,18,306,5049,83232,1370880,22579128,371880576,6124915584, %T A162804 100877977152,1661470525440,27364587522048,450697523867136, %U A162804 7423033790767104,122258117131149312,2013603551504732160,33164254102629777408 %N A162804 Number of reduced words of length n in Coxeter group on 18 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I. %C A162804 The initial terms coincide with those of A170737, although the two sequences are eventually different. %C A162804 Computed with MAGMA using commands similar to those used to compute A154638. %H A162804 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (16, 16, -136). %F A162804 G.f.: (t^3 + 2*t^2 + 2*t + 1)/(136*t^3 - 16*t^2 - 16*t + 1) %K A162804 nonn %O A162804 0,2 %A A162804 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009