1270075950domain: NAppears in sequencesNumber of totally isotropic spaces of index n in orthogonal geometry of dimension 2n.at n=8A028361Irregular triangular array T; row n shows the coefficients of the (n-1)-st polynomial in the obverse convolution s(x)**t(x), where s(x) = 2^n and t(x) = 2x+1. See Comments.at n=35A375045