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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
OFFSET
1,4
LINKS
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 A345960 A271183
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 19 2005
STATUS
approved