Number of nXnXn triangular 0..3 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.
A271241
Number of nXnXn triangular 0..3 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.
Terms
- a(0) =0a(1) =0a(2) =64a(3) =19200a(4) =9523200a(5) =10151116800
External references
- oeis: A271241