The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A161476 Number of reduced words of length n in the Weyl group A_15. 0
 1, 15, 119, 664, 2924, 10813, 34900, 100913, 266338, 650658, 1487262, 3208036, 6574987, 12876702, 24210652, 43874857, 76893687, 130701986, 216008661, 347854815, 546871981, 840732790, 1265769513, 1868715733, 2708503701 (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 PoincarĂ© polynomial. N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche I.) LINKS 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: A331211 A183475 A253804 * A162321 A161875 A259746 Adjacent sequences:  A161473 A161474 A161475 * A161477 A161478 A161479 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 26 03:20 EST 2020. Contains 338632 sequences. (Running on oeis4.)