143661domain: NAppears in sequencesa(n) = n + n*(n-1)*(n-2)*(n-3).at n=21A001094Number of (4+1) X (n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.at n=21A250759Numbers of the form a^7 + b^8, with integers a, b > 0.at n=19A303377