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A163091 Number of reduced words of length n in Coxeter group on 15 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I. 0

%I

%S 1,15,210,2940,41055,573300,8005725,111793500,1561106820,21799608285,

%T 304414090890,4250899269435,59360407871310,828920611657320,

%U 11575213262103855,161638593827703720,2257153663002754425

%N Number of reduced words of length n in Coxeter group on 15 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.

%C The initial terms coincide with those of A170734, although the two sequences are eventually different.

%C Computed with MAGMA using commands similar to those used to compute A154638.

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (13, 13, 13, -91).

%F G.f.: (t^4 + 2*t^3 + 2*t^2 + 2*t + 1)/(91*t^4 - 13*t^3 - 13*t^2 - 13*t + 1)

%K nonn

%O 0,2

%A _John Cannon_ and _N. J. A. Sloane_, Dec 03 2009

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Last modified October 21 11:15 EDT 2019. Contains 328294 sequences. (Running on oeis4.)