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URL: https://oeis.org/A283277

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A283277
Number of n X 3 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors.
1
8, 50, 287, 1725, 10299, 61491, 367208, 2192810, 13094522, 78194882, 466946550, 2788405644, 16651169555, 99433684945, 593775569480, 3545774525272, 21173853607285, 126441225573015, 755053086743011, 4508855092288477, 26924960112341884, 160784381447760958, 960135770291795456
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +5*a(n-2) +6*a(n-3) -7*a(n-4) -a(n-5) -4*a(n-6) +11*a(n-7) -12*a(n-8) +7*a(n-9) -9*a(n-10) +6*a(n-11) -2*a(n-12).
EXAMPLE
Some solutions for n=4:
..1..1..0. .1..0..1. .0..0..1. .0..0..0. .0..0..0. .0..0..0. .0..1..1
..0..0..0. .1..0..0. .0..0..0. .1..1..1. .0..0..0. .0..0..1. .1..0..1
..0..0..0. .1..0..0. .1..0..0. .0..0..1. .0..1..1. .0..1..0. .0..0..1
..0..1..0. .1..1..0. .0..1..0. .0..1..0. .0..0..0. .0..1..0. .1..1..0
CROSSREFS
Column 3 of A283282.
Sequence in context: A133357 A387403 A081675 * A081180 A052177 A127745
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 04 2017
STATUS
approved