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Search: id:A007990
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| A007990 |
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Poincare series of Lie algebra associated with a certain braid group. |
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+0
1
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| 3, 6, 18, 42, 94, 180, 348, 602, 1047, 1692, 2737, 4194, 6426, 9450, 13863, 19716, 27933, 38616, 53160, 71748, 96396, 127440, 167704, 217740, 281439, 359654, 457617, 576630, 723592, 900396, 1116033, 1373166, 1683327, 2050212, 2488416
(list; graph; listen)
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OFFSET
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2,1
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REFERENCES
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S. P. Humphries, Braid groups, infinite Lie algebras of Cartan type and rings of invariants, Topology and its Applications, 95 (3) (1999) pp. 173-205.
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LINKS
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S. P. Humphries, Home page
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FORMULA
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The Humphries paper gives a g.f. with denominator (1-x^4)*(1-x^3)^2*(1-x^2)^4*(1-x)^2. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Jun 11 2005
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CROSSREFS
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Adjacent sequences: A007987 A007988 A007989 this_sequence A007991 A007992 A007993
Sequence in context: A034457 A026532 A081150 this_sequence A121188 A120718 A032120
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KEYWORD
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nonn
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AUTHOR
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Stephen P Humphries (steve(AT)math.byu.edu)
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EXTENSIONS
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More terms from Ralf Stephan (ralf(AT)ark.in-berlin.de), Jun 11 2005
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