6415409881domain: NAppears in sequencesNumber of (n+1)X3 0..2 arrays with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.at n=7A183964Number of (n+1) X 9 0..2 arrays with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.at n=1A183969