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 A163177 #10 Jul 09 2024 19:17:08
%S A163177 1,26,650,16250,405925,10140000,253297200,6327360000,158057355300,
%T A163177 3948270300000,98627731207200,2463719204700000,61543667742382800,
%U A163177 1537359871188960000,38403225875902867200,959311990194611040000
%N A163177 Number of reduced words of length n in Coxeter group on 26 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.
%C A163177 The initial terms coincide with those of A170745, although the two sequences are eventually different.
%C A163177 Computed with MAGMA using commands similar to those used to compute A154638.
%H A163177 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (24,24,24,-300).
%F A163177 G.f.: (t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(300*t^4 - 24*t^3 - 24*t^2 - 24*t + 1).
%t A163177 coxG[{4,300,-24}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Jul 09 2024 *)
%o A163177 (PARI) Vec((t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(300*t^4 - 24*t^3 - 24*t^2 - 24*t + 1) + O(t^20)) \\ _Jinyuan Wang_, Mar 23 2020
%K A163177 nonn
%O A163177 0,2
%A A163177 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009