Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 n X n array.
A218803
Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 n X n array.
Terms
- a(0) =1a(1) =15a(2) =481a(3) =63499a(4) =32496361a(5) =66531801953
External references
- oeis: A218803