Hilltop maps: number of nX2 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..3 nX2 array.
A218190
Hilltop maps: number of nX2 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..3 nX2 array.
Terms
- a(0) =3a(1) =15a(2) =63a(3) =251a(4) =1001a(5) =4001a(6) =16001a(7) =63985a(8) =255867a(9) =1023171a(10) =4091495a(11) =16361227a(12) =65425905a(13) =261627633a(14) =1046206665a(15) =4183611549a(16) =16729587163a(17) =66898918163a(18) =267517973263
External references
- oeis: A218190