Hilltop maps: number of 4Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 4Xn array.
A218639
Hilltop maps: number of 4Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 4Xn array.
Terms
- a(0) =1a(1) =251a(2) =4087a(3) =65523a(4) =1048363a(5) =16773477a(6) =268375113a(7) =4294000777a(8) =68704008397
External references
- oeis: A218639