Hilltop maps: number of n X 3 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 n X 3 array.
A218805
Hilltop maps: number of n X 3 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 n X 3 array.
Terms
- a(0) =7a(1) =61a(2) =481a(3) =3843a(4) =30719a(5) =245509a(6) =1962145a(7) =15681787a(8) =125331399a(9) =1001668973a(10) =8005501761a(11) =63981275411a(12) =511348785535
External references
- oeis: A218805