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 A164628 #11 Feb 22 2024 13:33:33
%S A164628 1,17,272,4352,69632,1114112,17825792,285212536,4563398400,
%T A164628 73014339720,1168228880640,18691653212160,299066309345280,
%U A164628 4785058676736000,76560902463178680,1224973857577579200,19599572411913213000
%N A164628 Number of reduced words of length n in Coxeter group on 17 generators S_i with relations (S_i)^2 = (S_i S_j)^7 = I.
%C A164628 The initial terms coincide with those of A170736, although the two sequences are eventually different.
%C A164628 Computed with MAGMA using commands similar to those used to compute A154638.
%H A164628 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (15,15,15,15,15,15,-120).
%F A164628 G.f.: (t^7 + 2*t^6 + 2*t^5 + 2*t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(120*t^7 - 15*t^6 - 15*t^5 - 15*t^4 - 15*t^3 - 15*t^2 - 15*t + 1).
%t A164628 coxG[{7,120,-15}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Nov 13 2015 *)
%K A164628 nonn
%O A164628 0,2
%A A164628 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009