958384domain: NAppears in sequencesNumber of collinear point-triples in an n X n grid.at n=32A000938a(n)=number of tilings of a 4 X n rectangle using tiles that are either 1 X 1 squares or trominoes (here by a tromino we mean a 2 X 2 square with the upper right 1 X 1 square removed; no rotations allowed).at n=13A105262