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A218595
Hilltop maps: number of 4Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..2 4Xn array
1
1, 191, 3567, 56629, 898763, 14313773, 228191491, 3638365943, 58007785937, 924827168901, 14744666323421, 235076662350533, 3747866807725781, 59752871465350263, 952650082055322631, 15188260508053833233
OFFSET
1,2
COMMENTS
Row 4 of A218592
LINKS
EXAMPLE
Some solutions for n=3
..0..0..1....1..0..0....1..1..0....0..1..1....0..0..1....0..1..1....1..0..0
..0..0..0....0..0..1....1..0..0....1..1..1....1..1..0....0..1..1....1..0..1
..1..0..1....1..0..0....1..0..1....1..1..0....1..1..0....1..1..0....0..0..1
..1..0..0....0..1..1....1..1..1....0..0..1....1..1..1....1..1..0....1..1..0
CROSSREFS
Sequence in context: A061331 A177683 A209549 * A296580 A206860 A206954
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 03 2012
STATUS
approved