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 A164957 #6 Nov 23 2016 18:29:26 %S A164957 1,23,506,11132,244904,5387888,118533536,2607737792,57370231171, %T A164957 1262145080196,27767191642113,610878213438108,13439320636494060, %U A164957 295665052701694368,6504631130811427152,143101884248082720576 %N A164957 Number of reduced words of length n in Coxeter group on 23 generators S_i with relations (S_i)^2 = (S_i S_j)^8 = I. %C A164957 The initial terms coincide with those of A170742, although the two sequences are eventually different. %C A164957 Computed with MAGMA using commands similar to those used to compute A154638. %H A164957 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (21, 21, 21, 21, 21, 21, 21, -231). %F A164957 G.f. (t^8 + 2*t^7 + 2*t^6 + 2*t^5 + 2*t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(231*t^8 - %F A164957 21*t^7 - 21*t^6 - 21*t^5 - 21*t^4 - 21*t^3 - 21*t^2 - 21*t + 1) %K A164957 nonn %O A164957 0,2 %A A164957 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009