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A218593 Hilltop maps: number of 2Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..2 2Xn array 1
1, 13, 57, 225, 895, 3565, 14189, 56489, 224891, 895325, 3564433, 14190565, 56494859, 224914869, 895421261, 3564812065, 14192074291, 56500867089, 224938787413, 895516488309, 3565191179595, 14193583605661, 56506875907213 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A218592

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +3*a(n-2) +3*a(n-3) +a(n-4) +5*a(n-5) +2*a(n-6) +2*a(n-7) +a(n-8) +a(n-9) -a(n-10) -a(n-11) -a(n-12) -a(n-13) for n>14

EXAMPLE

Some solutions for n=3

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

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

CROSSREFS

Sequence in context: A210290 A007202 A222161 * A212405 A147384 A147011

Adjacent sequences:  A218590 A218591 A218592 * A218594 A218595 A218596

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 03 2012

STATUS

approved

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Last modified October 18 13:21 EDT 2021. Contains 348067 sequences. (Running on oeis4.)