47568618domain: NAppears in sequencesNumber of points of L1 norm 7 in cubic lattice Z^n.at n=21A035601Coordination sequence for 21-dimensional cubic lattice.at n=7A035716a(n) = Sum_{k=0..n} binomial(3*n,k) * binomial(4*n-k-1,n-k).at n=7A370098