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 A167848 #9 Nov 24 2016 11:13:20
%S A167848 1,42,1722,70602,2894682,118681962,4865960442,199504378122,
%T A167848 8179679503002,335366859623082,13750041244546362,563751691026400842,
%U A167848 23113819332082434522,947666592615379815402,38854330297230572431482
%N A167848 Number of reduced words of length n in Coxeter group on 42 generators S_i with relations (S_i)^2 = (S_i S_j)^15 = I.
%C A167848 The initial terms coincide with those of A170761, although the two sequences are eventually different.
%C A167848 Computed with MAGMA using commands similar to those used to compute A154638.
%H A167848 G. C. Greubel, <a href="/A167848/b167848.txt">Table of n, a(n) for n = 0..500</a>
%H A167848 <a href="/index/Rec#order_15">Index entries for linear recurrences with constant coefficients</a>, signature (40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, -820).
%F A167848 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)/(820*t^15 - 40*t^14 - 40*t^13 - 40*t^12 - 40*t^11 - 40*t^10 - 40*t^9 - 40*t^8 - 40*t^7 - 40*t^6 - 40*t^5 - 40*t^4 - 40*t^3 - 40*t^2 - 40*t + 1).
%t A167848 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)/(820*t^15 - 40*t^14 - 40*t^13 - 40*t^12 - 40*t^11 - 40*t^10 - 40*t^9 - 40*t^8 - 40*t^7 - 40*t^6 - 40*t^5 - 40*t^4 - 40*t^3 - 40*t^2 - 40*t + 1), {t, 0, 50}], t] (* _G. C. Greubel_, Jun 28 2016 *)
%K A167848 nonn
%O A167848 0,2
%A A167848 _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009