

A003178


Number of indecomposable selfdual binary codes of length 2n.
(Formerly M0356)


11



1, 1, 0, 0, 1, 0, 1, 1, 2, 2, 6, 8, 26, 45, 148, 457, 2523, 20786
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OFFSET

0,9


REFERENCES

R. T. Bilous, Enumeration of binary selfdual codes of length 34, Preprint, 2005.
R. T. Bilous and G. H. J. van Rees, An enumeration of binary selfdual codes of length 32, Designs, Codes Crypt., 26 (2002), 6186.
J. H. Conway and V. S. Pless, On the enumeration of selfdual codes, J. Comb. Theory, A28 (1980), 2653.
V. S. Pless, The children of the (32,16) doubly even codes, IEEE Trans. Inform. Theory, 24 (1978), 738746.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Table of n, a(n) for n=0..17.
G. Nebe, E. M. Rains and N. J. A. Sloane, SelfDual Codes and Invariant Theory, Springer, Berlin, 2006.
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

Cf. A003179, A028362, A028363. Equals A106162 + A106164.
Sequence in context: A197465 A074933 A157253 * A079494 A169970 A201499
Adjacent sequences: A003175 A003176 A003177 * A003179 A003180 A003181


KEYWORD

nonn,hard,more,nice


AUTHOR

N. J. A. Sloane.


EXTENSIONS

a(16) corrected and a(17) added by N. J. A. Sloane, based on data in Bilous's paper, Sep 06 2005


STATUS

approved



