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A001647 Number of indecomposable self-dual codes of length 2n over GF(4). +0
1
1, 0, 1, 1, 2, 4, 10, 31 (list; graph; listen)
OFFSET

1,5

REFERENCES

Conway, Pless, Sloane, Self-Dual Codes ..., IEEE Trans. Information Theory 25 312-322 1979.

F. J. MacWilliams, A. M. Odlyzko, N. J. A. Sloane and H. N. Ward, Self-Dual Codes over GF(4), J. Combin. Theory, A 25 288-318 1978.

LINKS

E. M. Rains and N. J. A. Sloane, Self-dual codes, pp. 177-294 of Handbook of Coding Theory, Elsevier, 1998 (Abstract, pdf, ps).

CROSSREFS

Sequence in context: A005193 A101901 A124384 this_sequence A007177 A138415 A005268

Adjacent sequences: A001644 A001645 A001646 this_sequence A001648 A001649 A001650

KEYWORD

nonn,hard,nice

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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