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A218235 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..3 n X n array 0
1, 15, 511, 65535, 33552513, 68715299265, 562915602593793 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A218242

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A218312 A218280 A218632 * A212739 A009068 A268960

Adjacent sequences:  A218232 A218233 A218234 * A218236 A218237 A218238

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 24 2012

STATUS

approved

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Last modified January 24 22:09 EST 2021. Contains 340414 sequences. (Running on oeis4.)