A221451 Hilltop maps: number of 6Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 6Xn array

1, 1201, 65569, 2897357, 157933741, 8569227073, 456064257841, 24333809830873, 1300168164767193, 69442977248777937, 3708745793506329473, 198080464024573391557, 10579291552464655635125, 565028486364173641870457

Offset

1,2

Comments

Row 6 of A221446

Links

R. H. Hardin, Table of n, a(n) for n = 1..65

Example

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

Crossrefs

Sequence in context: A020390 A156620 A214116 * A133142 A068534 A252340

Adjacent sequences: A221448 A221449 A221450 * A221452 A221453 A221454

Keyword

nonn

Author

R. H. Hardin Jan 17 2013

Status

approved