Number of n X n 0..n arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order.
A209677
Number of n X n 0..n arrays with every element equal to a diagonal or antidiagonal reflection, and new values 0 upwards introduced in row major order.
Terms
- a(0) =1a(1) =14a(2) =1243a(3) =6716352a(4) =268997909000
External references
- oeis: A209677