62718516080domain: NAppears in sequences1/4 the number of (n+1)X3 0..3 arrays with every 2X2 subblock having one or three distinct clockwise edge differences.at n=6A2100711/4 the number of (n+1)X8 0..3 arrays with every 2X2 subblock having one or three distinct clockwise edge differences.at n=1A210076