103378275domain: NAppears in sequencesNumber of relaxed compacted binary trees of right height at most one with empty initial and final sequence on level 0.at n=10A288950T(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=26A368493