1/3 of the number of colorings of an n X n square array with 3 colors.

A068253

1/3 of the number of colorings of an n X n square array with 3 colors.

Terms

    a(0) =1a(1) =6a(2) =82a(3) =2604a(4) =193662a(5) =33865632a(6) =13956665236

External references