A219068 Hilltop maps: number of 7Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..2 7Xn array

1, 14719, 2053803, 264274797, 33731920377, 4315258520649, 552229937914889, 70669820168384171, 9043666108418141267, 1157321782620917173897, 148102961593696388657529

Offset

1,2

Comments

Row 7 of A219063

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
..0..1..0....0..0..1....0..1..0....0..1..0....0..0..1....0..0..0....0..0..0
..0..0..1....1..0..0....0..0..0....1..0..1....0..0..0....1..1..0....0..1..1
..0..1..1....0..1..1....1..0..1....1..1..1....1..0..1....0..1..1....0..1..0
..1..0..0....0..1..1....1..0..0....1..1..0....0..1..1....0..1..1....1..1..0
..1..0..0....1..0..0....1..1..0....0..1..0....0..0..1....1..1..1....0..0..0
..0..0..1....1..1..0....0..1..0....0..1..0....0..1..1....0..1..0....1..1..0

Crossrefs

Sequence in context: A291145 A256839 A015312 * A023333 A249464 A209513

Adjacent sequences: A219065 A219066 A219067 * A219069 A219070 A219071

Keyword

nonn

Author

R. H. Hardin Nov 11 2012

Status

approved