Hilltop maps: number of 2 X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 2 X n array.
A221447
Hilltop maps: number of 2 X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 2 X n array.
Terms
- a(0) =1a(1) =9a(2) =33a(3) =117a(4) =429a(5) =1577a(6) =5785a(7) =21217a(8) =77825a(9) =285473a(10) =1047145a(11) =3841029a(12) =14089277a(13) =51680881a(14) =189570641a(15) =695364065a(16) =2550664929a(17) =9356094041a(18) =34319088593a(19) =125885849013a(20) =461761883309
External references
- oeis: A221447