Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 nX4 array.
A218422
Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..1 nX4 array.
Terms
- a(0) =9a(1) =191a(2) =2725a(3) =41515a(4) =629659a(5) =9539915a(6) =144597047a(7) =2191517757a(8) =33214850067a(9) =503408006597
External references
- oeis: A218422