317222212domain: NAppears in sequencesNumber of points of L1 norm 9 in cubic lattice Z^n.at n=18A035603Coordination sequence for 18-dimensional cubic lattice.at n=9A035713a(n) = Sum_{k=0..n} binomial(2*n,k) * binomial(3*n-k-1,n-k).at n=9A370099