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A028363
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Total number of doubly-even self-dual binary codes of length 8n.
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3
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OFFSET
| 0,2
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REFERENCES
| F. J. MacWilliams and N. J. A. Sloane, The Theory of Error-Correcting Codes, Elsevier-North Holland, 1978, p. 631.
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FORMULA
| 2*product( 2^i+1, i=1..n/2-2).
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CROSSREFS
| Cf. A028362, A003178, A003179.
Sequence in context: A005801 A079601 A140762 * A085012 A086019 A040968
Adjacent sequences: A028360 A028361 A028362 * A028364 A028365 A028366
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KEYWORD
| nonn,easy,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| There is an error in Eq. (75) of F. J. MacWilliams and N. J. A. Sloane, the lower subscript should be 1 not 0.
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