Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
A192888
Number of nXnXn triangular 0..2 arrays with each element equal to at least two neighbors, containing at least one 2 and with new values 0..2 introduced in row major order