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..4 nX2 array.
A218282
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..4 nX2 array.
Terms
- a(0) =3a(1) =15a(2) =63a(3) =255a(4) =1019a(5) =4073a(6) =16289a(7) =65153a(8) =260609a(9) =1042417a(10) =4169595a(11) =16678079a(12) =66711107a(13) =266839591a(14) =1067339019a(15) =4269278705a(16) =17076805345a(17) =68305983505a(18) =273218982601
External references
- oeis: A218282