383548domain: NAppears in sequencesNumber of different fixed (possibly) disconnected trominoes bounded (not necessarily tightly) by an n*n square.at n=22A162673Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101.at n=7A259997Fixed points of A368207.at n=16A368341