Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..4 nX4 array.
A218284
Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..4 nX4 array.
Terms
- a(0) =15a(1) =255a(2) =4091a(3) =65507a(4) =1048307a(5) =16772877a(6) =268366049a(7) =4293856057a(8) =68701687597
External references
- oeis: A218284