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 A161976 #9 Mar 17 2025 22:15:57
%S A161976 1,30,464,4930,40454,273266,1581775,8064464,36943940,154385704,
%T A161976 595514217,2140442150,7224301969,23043923160,69844600965,202081362622,
%U A161976 560350431315,1494273031164,3843681391300,9562404542460,23062890166272,54038223288580,123239023118274,274026717741240
%N A161976 Number of reduced words of length n in the Weyl group B_30.
%C A161976 Computed with MAGMA using commands similar to those used to compute A161409.
%D A161976 J. E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge, 1990. See under Poincaré polynomial.
%D A161976 N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche II.)
%H A161976 Andrew Howroyd, <a href="/A161976/b161976.txt">Table of n, a(n) for n = 0..900</a>
%F A161976 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 A161976 Row n=30 of A128084.
%K A161976 nonn,fini,full
%O A161976 0,2
%A A161976 _John Cannon_ and _N. J. A. Sloane_, Nov 30 2009