118599domain: NAppears in sequencesStella octangula numbers: a(n) = n*(2*n^2 - 1).at n=39A007588Small rhombicuboctahedron with faces of centered polygons.at n=19A193250Triangle read by rows: T(n,k) is the number of forests of labeled rooted Greg hypertrees with n white vertices and k black vertices, 0 <= k < n.at n=16A370949