Number of n X n symmetric 0..3 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 3 and with new values 0..3 introduced in lower triangular row major order.

A192766

Number of n X n symmetric 0..3 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 3 and with new values 0..3 introduced in lower triangular row major order.