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 A161932 #9 Mar 17 2025 22:18:31
%S A161932 1,25,324,2900,20149,115805,572975,2507895,9904050,35818770,120016066,
%T A161932 376029250,1110031585,3106677225,8286768736,21161266240,51931463950,
%U A161932 122883804990,281186004075,623785796595,1344621849285,2822018693325,5776896838830,11553274693950,22605993901319
%N A161932 Number of reduced words of length n in the Weyl group B_25.
%C A161932 Computed with MAGMA using commands similar to those used to compute A161409.
%D A161932 J. E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge, 1990. See under Poincaré polynomial.
%D A161932 N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche II.)
%H A161932 Andrew Howroyd, <a href="/A161932/b161932.txt">Table of n, a(n) for n = 0..625</a>
%F A161932 G.f. for B_m is the polynomial Prod_{k=1..m}(1-x^(2k))/(1-x). Only finitely many terms are nonzero. This is a row of the triangle in A128084.
%Y A161932 Row n=25 of A128084.
%K A161932 nonn,fini,full
%O A161932 0,2
%A A161932 _John Cannon_ and _N. J. A. Sloane_, Nov 30 2009