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A218803 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 n X n array 0
1, 15, 481, 63499, 32496361, 66531801953, 544920898689805, 17853080088569676529, 2339690141788794554403313, 1226489723856405899902679483839 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A218810

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A275411 A289185 A079610 * A252929 A218198 A208624

Adjacent sequences:  A218800 A218801 A218802 * A218804 A218805 A218806

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 06 2012

STATUS

approved

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Last modified September 20 16:50 EDT 2021. Contains 347586 sequences. (Running on oeis4.)