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A282435
Number of nX2 0..1 arrays with no 1 equal to more than three of its king-move neighbors, with the exception of exactly one element.
1
0, 0, 2, 12, 58, 280, 1276, 5592, 24004, 101280, 421414, 1734516, 7075870, 28650904, 115279840, 461334112, 1837537544, 7289020544, 28808705642, 113494402076, 445829029698, 1746749291480, 6827606048772, 26630217885224, 103664500940172
OFFSET
1,3
COMMENTS
Column 2 of A282441.
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) -7*a(n-2) +8*a(n-3) -47*a(n-4) -2*a(n-5) -53*a(n-6) +52*a(n-7) +4*a(n-8) +56*a(n-9) -16*a(n-10) -16*a(n-12)
EXAMPLE
Some solutions for n=4
..1..0. .1..1. .0..1. .0..1. .1..1. .0..0. .1..1. .1..1. .1..1. .1..0
..1..1. .1..0. .1..1. .1..1. .1..0. .1..1. .0..1. .0..1. .0..1. .1..1
..0..1. .1..1. .0..1. .1..0. .1..1. .0..1. .1..1. .1..1. .1..1. .1..0
..1..1. .0..1. .1..1. .1..1. .1..0. .1..1. .1..0. .0..0. .0..1. .1..1
CROSSREFS
Cf. A282441.
Sequence in context: A281028 A054145 A285364 * A001758 A037133 A009618
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 15 2017
STATUS
approved