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Search: id:A004657
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| A004657 |
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G.f.: (1+x^3)*(1+x^4)/((1-x)*(1-x^2)^2*(1-x^4)). |
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+0
2
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| 1, 1, 3, 4, 9, 11, 19, 24, 37, 45, 63, 76, 101, 119, 151, 176, 217, 249, 299, 340, 401, 451, 523, 584, 669, 741, 839, 924, 1037, 1135, 1263, 1376, 1521, 1649, 1811, 1956, 2137, 2299, 2499, 2680, 2901, 3101
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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M. Klemm, Selbstduale Codes ueber dem Ring der ganzen Zahlen modulo 4, Arch. Math. (Basel), 53 (1989), 201-207.
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LINKS
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G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.
A. R. Calderbank and N. J. A. Sloane, Double circulant codes over Z_4, J. Algeb. Combin., 6 (1997) 119-131 (Abstract, pdf, ps).
Index entries for Molien series
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CROSSREFS
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Sequence in context: A091380 A050006 A023420 this_sequence A054075 A062798 A035256
Adjacent sequences: A004654 A004655 A004656 this_sequence A004658 A004659 A004660
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Definition corrected Apr 08 2004.
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