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A221439 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..1 n X n array 1
1, 9, 221, 18393, 6415089, 8569227073, 43045366565233, 827667742380908273, 60943705772313538144913, 17137605013408451421126281145, 18409652574456111249919293718583541 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A221446

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..14

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A299548 A079913 A205578 * A205568 A264848 A033632

Adjacent sequences:  A221436 A221437 A221438 * A221440 A221441 A221442

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 17 2013

STATUS

approved

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Last modified January 18 00:43 EST 2022. Contains 350410 sequences. (Running on oeis4.)