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A089597
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G.f.: (1+x)*(1+x^3)*(1+x^5)*(1+x^7)/((1-x^2)*(1-x^4)*(1-x^6)*(1-x^8)).
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1
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1, 1, 1, 2, 3, 4, 5, 7, 10, 12, 14, 18, 23, 27, 31, 38, 46, 52, 59, 69, 80, 90, 100, 114, 130, 143, 157, 176, 196, 214, 233, 257, 283, 306, 330, 360, 392, 421, 451, 488, 527, 562, 599, 643, 689, 732, 776, 828, 883, 933, 985, 1046, 1109, 1168, 1229, 1299, 1372, 1440, 1510
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| Poincare series (or Molien series) for symmetric invariants in F_2(b_1, b_2, ... b_n) \otimes E(e_1, e_2, ... e_n) with b_i 2-dimensional, e_i one-dimensional and the permutation action of S_n, in the case n=4.
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REFERENCES
| A. Adem and R. J. Milgram, Cohomology of Finite Groups, Springer-Verlag, 2nd. ed., 2004; p. 108.
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CROSSREFS
| Sequence in context: A005520 A048183 A122975 * A022957 A036028 A036033
Adjacent sequences: A089594 A089595 A089596 * A089598 A089599 A089600
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 31 2003
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