4203520

Appears in sequences

• Dirichlet convolution of powers of 2 (2,4,8,...) with themselves.at n=19A034713
• Number of tilings of the n X n grid, using diagonal lines to connect the grid points.at n=4A295229
• The number of ways of tiling the n X n grid up to the symmetries of the square by a tile that is fixed under both horizontal and vertical reflection, but not diagonal reflection.at n=4A367522