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A161525 Number of reduced words of length n in the Weyl group A_25. 0

%I #5 Jul 19 2015 10:32:36

%S 1,25,324,2899,20124,115480,570050,2487421,9785321,35225346,117389766,

%T 365534676,1071606665,2976282415,7872887865,19923350639,48420830029,

%U 113395054929,256634690379,562744102479,1198306570554,2482933033659

%N Number of reduced words of length n in the Weyl group A_25.

%C Computed with MAGMA using commands similar to those used to compute A161409.

%D J. E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge, 1990. See under Poincaré polynomial.

%D N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche I.)

%F G.f. for A_m is the polynomial Prod_{k=1..m}(1-x^(k+1))/(1-x). Only finitely many terms are nonzero. This is a row of the triangle in A008302.

%K nonn

%O 0,2

%A _John Cannon_ and _N. J. A. Sloane_, Nov 30 2009

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)