1/3 the number of n X n 0..2 arrays with no element equal both to the element above and to the element to its left.

A184687

1/3 the number of n X n 0..2 arrays with no element equal both to the element above and to the element to its left.

Terms

    a(0) =1a(1) =24a(2) =4080a(3) =4890528a(4) =41325395328

External references