Number of n X n 0..2 arrays with every element equal to a diagonal or antidiagonal reflection.
A209587
Number of n X n 0..2 arrays with every element equal to a diagonal or antidiagonal reflection.
Terms
- a(0) =3a(1) =81a(2) =3645a(3) =1476225a(4) =996451875
External references
- oeis: A209587