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A218349 Hilltop maps: number of nX3 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or vertical neighbor in a random 0..1 nX3 array 2
5, 41, 291, 2069, 14811, 105913, 757305, 5415209, 38722037, 276885777, 1979899795, 14157473937, 101234450215, 723887182917, 5176228570197, 37013146305509, 264666248964889, 1892522801570497, 13532675845407459, 96766768350125913 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A218354

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 6*a(n-1) +5*a(n-2) +22*a(n-3) +7*a(n-4) +8*a(n-5) -18*a(n-6) -20*a(n-7) -a(n-8) +4*a(n-9) +3*a(n-10) +a(n-12)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A308247 A223009 A155455 * A154577 A198688 A202249

Adjacent sequences:  A218346 A218347 A218348 * A218350 A218351 A218352

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 26 2012

STATUS

approved

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Last modified June 7 01:26 EDT 2020. Contains 334836 sequences. (Running on oeis4.)