19165418domain: NAppears in sequencesNumber of (n+1) X 2 0..2 arrays with every 2 X 2 subblock nonsingular.at n=7A183690Number of (n+1)X9 0..2 arrays with every 2X2 subblock nonsingular.at n=0A183697T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock nonsingular.at n=28A183698