710460576domain: NAppears in sequencesNumber of (n+1) X (n+1) 0..3 arrays with every 2 X 2 subblock nonsingular.at n=2A183701Number of (n+1)X4 0..3 arrays with every 2X2 subblock nonsingular.at n=2A183704T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with every 2 X 2 subblock nonsingular.at n=12A183710