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..1 n X n array.
A221439
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..1 n X n array.
Terms
- a(0) =1a(1) =9a(2) =221a(3) =18393a(4) =6415089a(5) =8569227073
External references
- oeis: A221439