A110859 Number of even formally self-dual (but not self-dual) binary codes of length 2n.

0, 0, 1, 3, 12, 26, 95, 907

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 A345960 A271183

Adjacent sequences: A110856 A110857 A110858 * A110860 A110861 A110862

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 19 2005

Status

approved