4922775

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