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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
0
1, 15, 503, 64577, 32958333, 67441480753, 552229937914889, 18087169043098830871
OFFSET
1,2
COMMENTS
Diagonal of A219063
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 11 2012
STATUS
approved