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 A169022 #10 Apr 13 2018 13:41:06
%S A169022 1,9,72,576,4608,36864,294912,2359296,18874368,150994944,1207959552,
%T A169022 9663676416,77309411328,618475290624,4947802324992,39582418599936,
%U A169022 316659348799488,2533274790395904,20266198323167232,162129586585337856
%N A169022 Number of reduced words of length n in Coxeter group on 9 generators S_i with relations (S_i)^2 = (S_i S_j)^24 = I.
%C A169022 The initial terms coincide with those of A003951, although the two sequences are eventually different.
%C A169022 First disagreement at index 24: a(24) = 5312662293228350865372, A003951(24) = 5312662293228350865408. - Klaus Brockhaus, Apr 20 2011
%C A169022 Computed with MAGMA using commands similar to those used to compute A154638.
%H A169022 <a href="/index/Rec#order_24">Index entries for linear recurrences with constant coefficients</a>, signature (7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, -28).
%F A169022 G.f.: (t^24 + 2*t^23 + 2*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)/(28*t^24 - 7*t^23 - 7*t^22 - 7*t^21 - 7*t^20 - 7*t^19 - 7*t^18 - 7*t^17 - 7*t^16 - 7*t^15 - 7*t^14 - 7*t^13 - 7*t^12 - 7*t^11 - 7*t^10 - 7*t^9 - 7*t^8 - 7*t^7 - 7*t^6 - 7*t^5 - 7*t^4 - 7*t^3 - 7*t^2 - 7*t + 1).
%t A169022 coxG[{24,28,-7}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Apr 13 2018 *)
%Y A169022 Cf. A003951 (G.f.: (1+x)/(1-8*x)).
%K A169022 nonn
%O A169022 0,2
%A A169022 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009