A218816 Hilltop maps: number of 7Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 7Xn array

1, 14089, 1962145, 260019585, 33269071149, 4257533926265, 544920898689805, 69746876778780705, 8927330185180639569, 1142664774863616467437, 146256847938932844410005

Offset

1,2

Comments

Row 7 of A218810

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
..1..0..0....0..1..1....0..1..1....1..0..0....0..1..0....0..1..0....1..0..0
..1..1..1....1..1..1....1..1..1....1..0..0....1..1..1....1..0..1....1..0..0
..1..0..0....1..0..0....1..0..0....1..1..0....1..0..0....1..0..0....1..0..0
..1..0..0....0..0..0....0..0..1....0..1..1....0..1..0....1..0..0....1..0..0
..0..0..0....0..1..1....1..0..1....1..1..0....1..0..0....1..0..0....0..0..1
..1..1..1....1..1..0....1..1..0....0..0..0....1..0..0....0..1..1....1..0..0

Crossrefs

Sequence in context: A229699 A181963 A140708 * A254191 A254184 A253796

Adjacent sequences: A218813 A218814 A218815 * A218817 A218818 A218819

Keyword

nonn

Author

R. H. Hardin Nov 06 2012

Status

approved