Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 n X n array.
A218632
Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 n X n array.
Terms
- a(0) =1a(1) =15a(2) =511a(3) =65523a(4) =33546641a(5) =68702054721
External references
- oeis: A218632