981554domain: NAppears in sequencesNumber of (n+1)X(3+1) 0..2 arrays colored with the difference of the maximum and minimum in each 2X2 subblock.at n=6A236050Number of (n+1)X(7+1) 0..2 arrays colored with the difference of the maximum and minimum in each 2X2 subblock.at n=2A236054