Number of potential flows in n X n array with integer velocities in -11..11, i.e., number of n X n arrays with adjacent elements differing by no more than 11, counting arrays differing by a constant only once.

A068758

Number of potential flows in n X n array with integer velocities in -11..11, i.e., number of n X n arrays with adjacent elements differing by no more than 11, counting arrays differing by a constant only once.