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A110861 Number of even isodual (but not self-dual) binary codes of length 2n. 0
0, 0, 1, 3, 8, 20, 67, 331 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..8.

W. C. Huffman, On the classification and enumeration of self-dual codes, Finite Fields Applic., 11 (2005), 451-490.

CROSSREFS

Sequence in context: A302674 A108189 A148768 * A027320 A027319 A297973

Adjacent sequences:  A110858 A110859 A110860 * A110862 A110863 A110864

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 19 2005

STATUS

approved

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Last modified April 9 08:41 EDT 2020. Contains 333344 sequences. (Running on oeis4.)