

A003179


Number of selfdual binary codes of length 2n (up to column permutation equivalence).
(Formerly M0289)


20



1, 1, 1, 1, 2, 2, 3, 4, 7, 9, 16, 25, 55, 103, 261, 731, 3295, 24147, 519492
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OFFSET

0,5


COMMENTS

The length 36 binary self dual codes have been classified.  Nathan J. Russell, Feb 14 2016
This is number of binary selfdual codes of length 2n up to column permutation equivalence. Sequence A028362 gives an actual count of all possible binary selfdual codes of length 2n.  Nathan J. Russell, Nov 25 2018


REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

J. H. Conway, V. Pless and N. J. A. Sloane, The Binary SelfDual Codes of Length Up to 32: A Revised Enumeration, J. Comb. Theory, A28 (1980), 2653 (Abstract, pdf, ps, Table A, Table D).
E. M. Rains and N. J. A. Sloane, Selfdual codes, pp. 177294 of Handbook of Coding Theory, Elsevier, 1998 (Abstract, pdf, ps).


CROSSREFS



KEYWORD

nonn,hard,more,nice


AUTHOR



EXTENSIONS



STATUS

approved



