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A219064 Hilltop maps: number of 3Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..2 3Xn array 1
1, 59, 503, 4049, 32313, 258353, 2066359, 16527691, 132195391, 1057349609, 8457086257, 67643015889, 541034769831, 4327403486059, 34612231897959, 276841898493041, 2214287624855529, 17710721217845921, 141657137282377943 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A219063

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +6*a(n-2) +14*a(n-3) +10*a(n-4) +38*a(n-5) +23*a(n-6) -29*a(n-7) -52*a(n-8) -28*a(n-9) for n>10

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A284754 A125034 A140024 * A263127 A308649 A274503

Adjacent sequences:  A219061 A219062 A219063 * A219065 A219066 A219067

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 11 2012

STATUS

approved

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Last modified July 6 14:10 EDT 2022. Contains 355110 sequences. (Running on oeis4.)