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A110859 Number of even formally self-dual (but not self-dual) binary codes of length 2n. 0
0, 0, 1, 3, 12, 26, 95, 907 (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: A326725 A169678 A294366 * A190904 A271183 A125614

Adjacent sequences:  A110856 A110857 A110858 * A110860 A110861 A110862

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Sep 19 2005

STATUS

approved

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Last modified April 7 10:56 EDT 2020. Contains 333301 sequences. (Running on oeis4.)