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 A162768 #5 Nov 23 2016 15:22:27 %S A162768 1,13,156,1794,20592,235950,2703558,30975516,354897114,4066164102, %T A162768 46587289320,533764778118,6115505911086,70067216486124, %U A162768 802781471013522,9197712172364430,105380993789073288,1207382188488922446 %N A162768 Number of reduced words of length n in Coxeter group on 13 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I. %C A162768 The initial terms coincide with those of A170732, although the two sequences are eventually different. %C A162768 Computed with MAGMA using commands similar to those used to compute A154638. %H A162768 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (11, 11, -66). %F A162768 G.f.: (t^3 + 2*t^2 + 2*t + 1)/(66*t^3 - 11*t^2 - 11*t + 1) %K A162768 nonn %O A162768 0,2 %A A162768 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009