Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having three distinct values, and new values 0..2 introduced in lower triangle row major order.

A210809

Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having three distinct values, and new values 0..2 introduced in lower triangle row major order.