A210925 Number of n X n 0..3 symmetric matrices with every element equal to zero, two or three horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order

1, 3, 39, 2212, 314852, 110451021, 95121973827, 200885189935045, 1039262747697700932, 13162671799070468638683