A219057 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..2 n X n array

1, 15, 503, 64577, 32958333, 67441480753, 552229937914889, 18087169043098830871

Offset

1,2

Comments

Diagonal of A219063

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A062752 A218226 A208099 * A203525 A249962 A004703

Adjacent sequences: A219054 A219055 A219056 * A219058 A219059 A219060

Keyword

nonn

Author

R. H. Hardin Nov 11 2012

Status

approved