Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
A068759
Number of potential flows in n X n array with integer velocities in -12..12, i.e. number of n X n arrays with adjacent elements differing by no more than 12, counting arrays differing by a constant only once.