Hilltop maps: number of 2Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 2Xn array.
A218811
Hilltop maps: number of 2Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 2Xn array.
Terms
- a(0) =1a(1) =15a(2) =61a(3) =249a(4) =993a(5) =3969a(6) =15871a(7) =63467a(8) =253797a(9) =1014889a(10) =4058377a(11) =16228793a(12) =64896323a(13) =259509919a(14) =1037738269a(15) =4149747805a(16) =16594171517a(17) =66357412857a(18) =265352580967
External references
- oeis: A218811