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A218312 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..2 n X n array 0
1, 15, 511, 65089, 33296833, 68184176641, 558512367132769, 18299400300282885215 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A218319.

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3:

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

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

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

CROSSREFS

Sequence in context: A218365 A203326 A092561 * A218280 A218632 A218235

Adjacent sequences:  A218309 A218310 A218311 * A218313 A218314 A218315

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 2012

STATUS

approved

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Last modified February 25 11:54 EST 2021. Contains 341606 sequences. (Running on oeis4.)