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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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1
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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; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| M. Klemm, Selbstduale Codes ueber dem Ring der ganzen Zahlen modulo 4, Arch. Math. (Basel), 53 (1989), 201-207.
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LINKS
| 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
| Sequence in context: A050006 A176744 A023420 * A054075 A062798 A182828
Adjacent sequences: A004654 A004655 A004656 * A004658 A004659 A004660
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Definition corrected Apr 08 2004.
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