Hilltop maps: number of n X 1 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..3 n X 1 array.
A218189
Hilltop maps: number of n X 1 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..3 n X 1 array.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =15a(4) =29a(5) =57a(6) =113a(7) =225a(8) =449a(9) =895a(10) =1783a(11) =3551a(12) =7073a(13) =14089a(14) =28065a(15) =55905a(16) =111361a(17) =221827a(18) =441871a(19) =880191a(20) =1753309a(21) =3492529a(22) =6956993a(23) =13858081a(24) =27604801a(25) =54987775a(26) =109533679a(27) =218187167a(28) =434621025a(29) =865749521
External references
- oeis: A218189