491514domain: NAppears in sequencesNumber of (n+1)X8 0..3 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=11A206342Numbers n that are persistently squarefree for base-2 shifting (in A293430), and for which A163511(n) is also in A293430.at n=20A293437