A218815 Hilltop maps: number of 6Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 6Xn array.

1, 3551, 245509, 16252713, 1039771513, 66531801953, 4257699787069, 272481107247773, 17438263706240211, 1116016197551446895, 71422966710588065133, 4570937163077667987697, 292531483564098288209289

Offset

1,2

Comments

Row 6 of A218810

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Sequence in context: A253657 A251040 A253727 * A248855 A151810 A083955

Adjacent sequences: A218812 A218813 A218814 * A218816 A218817 A218818

Keyword

nonn

Author

R. H. Hardin, Nov 06 2012

Status

approved