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 A168928 #10 Jun 23 2018 19:53:53
%S A168928 1,11,110,1100,11000,110000,1100000,11000000,110000000,1100000000,
%T A168928 11000000000,110000000000,1100000000000,11000000000000,
%U A168928 110000000000000,1100000000000000,11000000000000000,110000000000000000
%N A168928 Number of reduced words of length n in Coxeter group on 11 generators S_i with relations (S_i)^2 = (S_i S_j)^22 = I.
%C A168928 The initial terms coincide with those of A003953, although the two sequences are eventually different.
%C A168928 First disagreement at index 22: a(22) = 10999999999999999999945, A003953(22) = 11000000000000000000000. - Klaus Brockhaus, Apr 09 2011
%C A168928 Computed with MAGMA using commands similar to those used to compute A154638.
%H A168928 <a href="/index/Rec#order_22">Index entries for linear recurrences with constant coefficients</a>, signature (9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, -45).
%F A168928 G.f.: (t^22 + 2*t^21 + 2*t^20 + 2*t^19 + 2*t^18 + 2*t^17 + 2*t^16 + 2*t^15 + 2*t^14 + 2*t^13 + 2*t^12 + 2*t^11 + 2*t^10 + 2*t^9 + 2*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^22 - 9*t^21 - 9*t^20 - 9*t^19 - 9*t^18 - 9*t^17 - 9*t^16 - 9*t^15 - 9*t^14 - 9*t^13 - 9*t^12 - 9*t^11 - 9*t^10 - 9*t^9 - 9*t^8 - 9*t^7 - 9*t^6 - 9*t^5 - 9*t^4 - 9*t^3 - 9*t^2 - 9*t + 1).
%t A168928 coxG[{22,45,-9}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Jun 23 2018 *)
%Y A168928 Cf. A003953 (G.f.: (1+x)/(1-10*x)).
%K A168928 nonn
%O A168928 0,2
%A A168928 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009