10458075domain: NAppears in sequencesSuccessive powers of the matrix A=[1,2;3,4] written by rows in groups of 4.at n=38A100638Number of n X 2 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically, diagonally or antidiagonally, and top left element zero.at n=9A233020