Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 nX4 array.
A218634
Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 nX4 array.
Terms
- a(0) =15a(1) =255a(2) =4095a(3) =65523a(4) =1048353a(5) =16773633a(6) =268378101a(7) =4294049121a(8) =68704778799
External references
- oeis: A218634