|
%I #5 Jul 19 2015 10:35:03
%S 1,11,65,274,923,2640,6655,15159,31758,61997,113906,198497,330121,
%T 526581,808896,1200626,1726701,2411747,3277965,4342688,5615807,
%U 7097310,8775209,10624132,12604826,14664752,16739858,18757500,20640357,22311069
%N Number of reduced words of length n in the Weyl group A_11.
%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
|
