A218198 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..2 n X n array

1, 15, 483, 61013, 30954777, 62898202889, 511326127735795

Offset

1,2

Comments

Diagonal of A218206

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A079610 A218803 A252929 * A208624 A013433 A013435

Adjacent sequences: A218195 A218196 A218197 * A218199 A218200 A218201

Keyword

nonn

Author

R. H. Hardin Oct 23 2012

Status

approved