A218287 Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..4 nX7 array

121, 16289, 2095233, 268366049, 34355128651, 4397469258389, 562876144341077

Offset

1,1

Comments

Column 7 of A218288

Links

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

Example

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

Crossrefs

Sequence in context: A050740 A121013 A287728 * A129450 A232279 A202887

Adjacent sequences: A218284 A218285 A218286 * A218288 A218289 A218290

Keyword

nonn

Author

R. H. Hardin Oct 25 2012

Status

approved