117392domain: NAppears in sequencesNumber of 4-block ordered bicoverings of an unlabeled n-set.at n=24A060091Column 0 of triangle A113290, which is the matrix log of A113287.at n=15A113292Number of 2:3:sqrt(13) proportioned triangles on a (n+1)X(n+1) grid.at n=29A190112