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 A162191 #5 Jul 19 2015 10:21:04
%S A162191 1,47,1127,18377,229171,2330589,20127092,151775596,1019876970,
%T A162191 6201909910,34546227171,177996721677,855147273198,3856508701234,
%U A162191 16418497039281,66308104573247,255104779810273,938387762441199
%N A162191 Number of reduced words of length n in the Weyl group B_47.
%C A162191 Computed with MAGMA using commands similar to those used to compute A161409.
%D A162191 J. E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge, 1990. See under Poincaré polynomial.
%D A162191 N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche II.)
%F A162191 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 A162191 nonn
%O A162191 0,2
%A A162191 _John Cannon_ and _N. J. A. Sloane_, Nov 30 2009