Hilltop maps: number of n X 4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 n X 4 array.
A221442
Hilltop maps: number of n X 4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 n X 4 array.
Terms
- a(0) =9a(1) =117a(2) =1465a(3) =18393a(4) =230845a(5) =2897357a(6) =36364977a(7) =456419681a(8) =5728560373a(9) =71899621813a(10) =902417942313
External references
- oeis: A221442