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 A162181 #5 Jul 19 2015 10:21:51
%S A162181 1,43,945,14147,162238,1519706,12107381,84352455,524443953,2954877827,
%T A162181 15270874059,73095540169,326649986846,1371916939730,5445905213996,
%U A162181 20530576252412,73812456221233,253999791183699,839265188017740
%N A162181 Number of reduced words of length n in the Weyl group B_43.
%C A162181 Computed with MAGMA using commands similar to those used to compute A161409.
%D A162181 J. E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge, 1990. See under Poincaré polynomial.
%D A162181 N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche II.)
%F A162181 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.
%K A162181 nonn
%O A162181 0,2
%A A162181 _John Cannon_ and _N. J. A. Sloane_, Nov 30 2009