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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 0
1, 15, 483, 61013, 30954777, 62898202889, 511326127735795 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 27 02:00 EDT 2021. Contains 348270 sequences. (Running on oeis4.)