45147495264domain: NAppears in sequences1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having distinct edge sums.at n=4A2097281/4 the number of (n+1)X6 0..3 arrays with every 2X2 subblock having distinct edge sums.at n=4A209733