4922775
domain: N
Appears in sequences
- Total number of self-dual binary codes of length 2n. Totally isotropic spaces of index n in symplectic geometry of dimension 2n.at n=6A028362
- Number of Type I (singly-even) self-dual binary codes of length 2n.at n=6A269455
- T(n,m) is the number of m-dimensional isotropic subspaces of a 2n-dimensional symplectic space over Z/2, n >= 0 and 0 <= m <= n.at n=27A368493