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Search: id:A161526
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| A161526 |
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Number of reduced words of length n in the Weyl group A_26. |
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+0
1
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| 1, 26, 350, 3249, 23373, 138853, 708903, 3196324, 12981645, 48206991, 165596757, 531131433, 1602738098, 4579020513, 12451908378, 32375259017, 80796089046, 194191143975, 450825834354, 1013569936833, 2211876507387, 4694809541046
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Computed with MAGMA using commands similar to those used to compute A161409.
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REFERENCES
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J. E. Humphreys, Reflection Groups and Coxeter Groups, Cambridge, 1990. See under Poincare polynomial.
N. Bourbaki, Groupes et alg. de Lie, Chap. 4, 5, 6. (The group is defined in Planche I.)
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FORMULA
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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.
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KEYWORD
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nonn,new
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AUTHOR
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John Cannon (john(AT)maths.usyd.edu.au) and N. J. A. Sloane (njas(AT)research.att.com), Nov 30 2009
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