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 A165368 #8 Sep 07 2023 16:45:07
%S A165368 1,25,600,14400,345600,8294400,199065600,4777574400,114661785600,
%T A165368 2751882854100,66045188491200,1585084523616300,38042028562651200,
%U A165368 913008685404268800,21912208447317811200,525893002678396108800
%N A165368 Number of reduced words of length n in Coxeter group on 25 generators S_i with relations (S_i)^2 = (S_i S_j)^9 = I.
%C A165368 The initial terms coincide with those of A170744, although the two sequences are eventually different.
%C A165368 Computed with MAGMA using commands similar to those used to compute A154638.
%H A165368 <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (23, 23, 23, 23, 23, 23, 23, 23, -276).
%F A165368 G.f. (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 +
%F A165368 1)/(276*t^9 - 23*t^8 - 23*t^7 - 23*t^6 - 23*t^5 - 23*t^4 - 23*t^3 -
%F A165368 23*t^2 - 23*t + 1)
%t A165368 coxG[{9,276,-23}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Sep 07 2023 *)
%K A165368 nonn
%O A165368 0,2
%A A165368 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009