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 A167854 #11 Oct 04 2017 19:32:11
%S A167854 1,44,1892,81356,3498308,150427244,6468371492,278139974156,
%T A167854 11960018888708,514280812214444,22114074925221092,950905221784506956,
%U A167854 40888924536733799108,1758223755079553361644,75603621468420794550692
%N A167854 Number of reduced words of length n in Coxeter group on 44 generators S_i with relations (S_i)^2 = (S_i S_j)^15 = I.
%C A167854 The initial terms coincide with those of A170763, although the two sequences are eventually different.
%C A167854 Computed with MAGMA using commands similar to those used to compute A154638.
%H A167854 G. C. Greubel, <a href="/A167854/b167854.txt">Table of n, a(n) for n = 0..500</a>
%H A167854 <a href="/index/Rec#order_15">Index entries for linear recurrences with constant coefficients</a>, signature (42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, -903).
%F A167854 G.f.: (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)/(903*t^15 - 42*t^14 - 42*t^13 - 42*t^12 - 42*t^11 - 42*t^10 - 42*t^9 - 42*t^8 - 42*t^7 - 42*t^6 - 42*t^5 - 42*t^4 - 42*t^3 - 42*t^2 - 42*t + 1).
%t A167854 CoefficientList[Series[(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)/(903*t^15 - 42*t^14 - 42*t^13 - 42*t^12 - 42*t^11 - 42*t^10 - 42*t^9 - 42*t^8 - 42*t^7 - 42*t^6 - 42*t^5 - 42*t^4 - 42*t^3 - 42*t^2 - 42*t + 1), {t, 0, 50}], t] (* _G. C. Greubel_, Jun 28 2016 *)
%t A167854 coxG[{15,903,-42}] (* The coxG program is at A169452 *) (* _Harvey P. Dale_, Oct 04 2017 *)
%K A167854 nonn
%O A167854 0,2
%A A167854 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009