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Search: id:A028363
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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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+0
4
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| 1, 30, 9845550, 171634285407048750, 193419995622362136809061156168750, 14272693289804307141953423466197932293533748208968750
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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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
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2*product( 2^i+1, i=1..n/2-2).
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CROSSREFS
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Cf. A028362, A003178, A003179.
Sequence in context: A079601 A159578 A140762 this_sequence A085012 A086019 A040968
Adjacent sequences: A028360 A028361 A028362 this_sequence A028364 A028365 A028366
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KEYWORD
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nonn,easy,nice
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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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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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