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A218192 Hilltop maps: number of nX4 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..3 nX4 array 1
15, 251, 4067, 65251, 1044001, 16703113, 267240217, 4275711525, 68409381991, 1094518209251, 17511781134639, 280180333840835, 4482754713004137, 71721985406792741, 1147518327444638505, 18359758229692585737 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A218196
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..1....1..0..0..1....0..0..0..1....1..1..1..1....0..1..1..0
..0..0..1..0....0..1..1..0....0..1..0..1....0..1..1..0....0..1..0..1
..0..0..0..0....0..1..0..0....1..0..0..0....1..0..0..0....0..1..1..0
CROSSREFS
Sequence in context: A285395 A331493 A093147 * A066410 A370317 A116508
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 23 2012
STATUS
approved

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Last modified May 22 10:24 EDT 2024. Contains 372745 sequences. (Running on oeis4.)