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 A164969 #8 Aug 23 2020 12:15:19
%S A164969 1,27,702,18252,474552,12338352,320797152,8340725952,216858874401,
%T A164969 5638330725300,146596598620875,3811511557982700,99099300347388900,
%U A164969 2576581804867917600,66991126818296818800,1741769294460722280000
%N A164969 Number of reduced words of length n in Coxeter group on 27 generators S_i with relations (S_i)^2 = (S_i S_j)^8 = I.
%C A164969 The initial terms coincide with those of A170746, although the two sequences are eventually different.
%C A164969 Computed with MAGMA using commands similar to those used to compute A154638.
%H A164969 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (25, 25, 25, 25, 25, 25, 25, -325).
%F A164969 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)/(325*t^8 -
%F A164969 25*t^7 - 25*t^6 - 25*t^5 - 25*t^4 - 25*t^3 - 25*t^2 - 25*t + 1)
%t A164969 coxG[{8,325,-25}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Aug 23 2020 *)
%K A164969 nonn
%O A164969 0,2
%A A164969 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009