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 A164780 #12 Feb 23 2024 04:20:19
%S A164780 1,11,110,1100,11000,110000,1100000,11000000,109999945,1099998900,
%T A164780 10999983555,109999781100,1099997266500,10999967220000,
%U A164780 109999617750000,1099995633000000,10999950885002970,109999454400086625
%N A164780 Number of reduced words of length n in Coxeter group on 11 generators S_i with relations (S_i)^2 = (S_i S_j)^8 = I.
%C A164780 The initial terms coincide with those of A003953, although the two sequences are eventually different.
%C A164780 Computed with MAGMA using commands similar to those used to compute A154638.
%H A164780 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (9, 9, 9, 9, 9, 9, 9, -45).
%F A164780 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)/(45*t^8 - 9*t^7 - 9*t^6 - 9*t^5 - 9*t^4 - 9*t^3 - 9*t^2 - 9*t + 1).
%t A164780 coxG[{8,45,-9}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Feb 10 2019 *)
%K A164780 nonn
%O A164780 0,2
%A A164780 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009