The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A161525 Number of reduced words of length n in the Weyl group A_25. 0
 1, 25, 324, 2899, 20124, 115480, 570050, 2487421, 9785321, 35225346, 117389766, 365534676, 1071606665, 2976282415, 7872887865, 19923350639, 48420830029, 113395054929, 256634690379, 562744102479, 1198306570554, 2482933033659 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Computed with MAGMA using commands similar to those used to compute A161409. REFERENCES J. E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge, 1990. See under Poincaré polynomial. N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche I.) LINKS Table of n, a(n) for n=0..21. FORMULA G.f. for A_m is the polynomial Prod_{k=1..m}(1-x^(k+1))/(1-x). Only finitely many terms are nonzero. This is a row of the triangle in A008302. CROSSREFS Sequence in context: A250559 A244446 A246625 * A161932 A162367 A263404 Adjacent sequences: A161522 A161523 A161524 * A161526 A161527 A161528 KEYWORD nonn AUTHOR John Cannon and N. J. A. Sloane, Nov 30 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 2 18:23 EDT 2023. Contains 363100 sequences. (Running on oeis4.)