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 A162456 #7 Feb 21 2024 11:52:34 %S A162456 1,47,1127,18377,229171,2330589,20127092,151775596,1019876970, %T A162456 6201909910,34546227171,177996721677,855147273198,3856508701234, %U A162456 16418497039281,66308104573247,255104779810273,938387762441199 %N A162456 Number of reduced words of length n in the Weyl group D_47. %C A162456 Computed with MAGMA using commands similar to those used to compute A161409. %D A162456 N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche IV.) %D A162456 J. E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge, 1990. See under Poincaré polynomial. %H A162456 <a href="/index/Gre#GROWTH">Index entries for growth series for groups</a> %F A162456 G.f. for D_m is the polynomial f(n) * Product( f(2i), i=1..n-1 )/ f(1)^n, where f(k) = 1-x^k. Only finitely many terms are nonzero. This is a row of the triangle in A162206. %Y A162456 Growth series for groups D_n, n = 3,...,50: A161435, A162207, A162208, A162209, A162210, A162211, A162212, A162248, A162288, A162297, A162300, A162301, A162321, A162327, A162328, A162346, A162347, A162359, A162360, A162364, A162365, A162366, A162367, A162368, A162369, A162370, A162376, A162377, A162378, A162379, A162380, A162381, A162384, A162388, A162389, A162392, A162399, A162402, A162403, A162411, A162412, A162413, A162418, A162452, A162456, A162461, A162469, A162492; also A162206. %K A162456 nonn %O A162456 0,2 %A A162456 _John Cannon_ and _N. J. A. Sloane_, Dec 01 2009