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A218226 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..2 n X n array 0
1, 15, 497, 63309, 32362849, 66220959971, 542011629493301, 17745059393526510913, 2323828045898042282454885 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A218233

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=3

..1..1..1....1..0..1....0..1..1....1..0..1....0..1..0....1..1..1....1..0..1

..0..0..1....0..0..1....1..0..0....0..0..0....0..0..0....1..1..1....0..0..1

..1..0..1....1..0..1....0..1..0....1..0..1....0..0..1....0..0..1....0..0..1

CROSSREFS

Sequence in context: A285765 A287070 A062752 * A208099 A219057 A203525

Adjacent sequences:  A218223 A218224 A218225 * A218227 A218228 A218229

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 24 2012

STATUS

approved

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Last modified June 28 18:26 EDT 2022. Contains 354907 sequences. (Running on oeis4.)