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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 0
121, 16289, 2095233, 268366049, 34355128651, 4397469258389, 562876144341077 (list; graph; refs; listen; history; text; internal format)
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

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Last modified March 25 09:47 EDT 2023. Contains 361520 sequences. (Running on oeis4.)