871232952domain: NAppears in sequencesNumber of (n+1) X 2 0..3 arrays with every 2 X 2 subblock nonsingular.at n=6A183702Number of (n+1)X8 0..3 arrays with every 2X2 subblock nonsingular.at n=0A183708T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with every 2 X 2 subblock nonsingular.at n=21A183710