484872198498domain: NAppears in sequencesNumber of (n+2)X4 0..3 arrays with each 3X3 subblock nonsingular.at n=2A184651T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with each 3X3 subblock nonsingular.at n=7A184652T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with each 3X3 subblock nonsingular.at n=8A184652