528328domain: NAppears in sequencesNumber of -n..n arrays x(0..3) of 4 elements with zeroth through 3rd differences all nonzero.at n=13A199945Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having two, three or four distinct values for every i,j,k<=n.at n=15A211722