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 A164777 #10 Feb 23 2024 04:20:24 %S A164777 1,9,72,576,4608,36864,294912,2359296,18874332,150994368,1207952676, %T A164777 9663603264,77308680960,618468286464,4947737001984,39581821698048, %U A164777 316653979043052,2533227076022832,20265778557681300,162125924058011088 %N A164777 Number of reduced words of length n in Coxeter group on 9 generators S_i with relations (S_i)^2 = (S_i S_j)^8 = I. %C A164777 The initial terms coincide with those of A003951, although the two sequences are eventually different. %C A164777 Computed with MAGMA using commands similar to those used to compute A154638. %H A164777 <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (7, 7, 7, 7, 7, 7, 7, -28). %F A164777 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)/(28*t^8 - 7*t^7 - 7*t^6 - 7*t^5 - 7*t^4 - 7*t^3 - 7*t^2 - 7*t + 1). %K A164777 nonn %O A164777 0,2 %A A164777 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009