105912domain: NAppears in sequencesMaximal number of regions into which 4-space can be divided by n hyperspheres.at n=35A059173Expansion of e.g.f. exp(x^2 * (exp(x) - 1)).at n=9A240989Square array T(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. exp(x^k * (exp(x) - 1)).at n=75A292892