279932domain: NAppears in sequencesMonotonic ordering of nonnegative differences 6^i-4^j, for 40>= i>=0, j>=0.at n=39A192164Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having two, three or four distinct values for every i<=n and j<=n.at n=6A211465