261250domain: NAppears in sequencesNumber of permutations of {1,2,...,n} in which each element follows its proper divisors.at n=12A016021Number of points of L1 norm 4 in cubic lattice Z^n.at n=25A035598Coordination sequence for 25-dimensional cubic lattice.at n=4A035720Coordination sequence for C_25 lattice.at n=2A035762