Hilltop maps: number of nX2 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..3 nX2 array.
A218366
Hilltop maps: number of nX2 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..3 nX2 array.
Terms
- a(0) =3a(1) =15a(2) =63a(3) =253a(4) =1009a(5) =4033a(6) =16129a(7) =64511a(8) =258015a(9) =1031935a(10) =4127233a(11) =16506913a(12) =66019585a(13) =264046081a(14) =1056055299a(15) =4223705151a(16) =16892756671a(17) =67562771965a(18) =270218073025
External references
- oeis: A218366