Number of n X n symmetric 0..2 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 2 and with new values 0..2 introduced in lower triangular row major order.

A192765

Number of n X n symmetric 0..2 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 2 and with new values 0..2 introduced in lower triangular row major order.