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A218642
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..3 7Xn array
0
1, 16001, 2092027, 268378101, 34351677143, 4396930705721, 562806164441653, 72039176523059285
OFFSET
1,2
COMMENTS
Row 7 of A218638
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..0..1....0..0..0....0..1..1....0..1..0....0..1..0....0..1..0....0..1..0
..0..1..0....1..0..1....0..0..0....0..0..1....0..1..0....1..1..0....1..0..0
..1..1..0....1..1..1....1..1..1....0..0..0....0..0..1....0..1..0....1..1..1
..0..0..1....0..0..0....1..0..0....1..1..0....0..0..1....0..1..0....0..1..1
..1..1..0....1..0..1....1..0..1....0..1..0....1..1..1....0..1..0....1..1..0
..1..1..0....1..0..1....1..0..0....0..1..1....0..1..0....1..0..1....1..0..0
CROSSREFS
Sequence in context: A129473 A372550 A237681 * A151811 A151877 A187854
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 03 2012
STATUS
approved