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A218803
Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 n X n array
0
1, 15, 481, 63499, 32496361, 66531801953, 544920898689805, 17853080088569676529, 2339690141788794554403313, 1226489723856405899902679483839
OFFSET
1,2
COMMENTS
Diagonal of A218810
EXAMPLE
Some solutions for n=3
..0..0..1....0..1..0....1..1..0....0..1..0....0..0..0....1..1..0....1..1..1
..1..0..1....0..0..0....1..0..0....0..1..0....0..1..0....0..1..1....1..1..0
..1..0..0....0..0..1....1..0..1....1..0..1....0..0..1....1..1..0....1..0..0
CROSSREFS
Sequence in context: A275411 A289185 A079610 * A252929 A218198 A377045
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 06 2012
STATUS
approved