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A233675
Number of (n+1) X (1+1) 0..3 arrays with every 2 X 2 subblock having the sum of the squares of the edge differences equal to 6.
1
48, 184, 648, 2440, 8712, 32456, 116872, 432456, 1565704, 5768392, 20957064, 76995656, 280355592, 1028180936, 3749152392, 13733970760, 50125386248, 183485530824, 670067844488, 2451649137224, 8956514967816, 32760264743368
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = a(n-1) + 12*a(n-2) - 4*a(n-3) - 16*a(n-4).
Empirical g.f.: 8*x*(6 + 17*x - 14*x^2 - 28*x^3) / (1 - x - 12*x^2 + 4*x^3 + 16*x^4). - Colin Barker, Oct 11 2018
EXAMPLE
Some solutions for n=5:
..3..1....1..2....2..2....0..1....1..1....3..2....2..1....1..2....3..1....1..1
..2..2....1..0....1..3....0..2....2..0....1..2....3..1....1..3....2..1....2..3
..0..1....1..2....1..2....0..1....2..1....1..0....2..2....2..2....3..1....1..1
..2..1....0..0....0..2....0..2....0..1....2..2....3..1....0..1....3..2....2..3
..0..1....1..2....0..1....1..2....2..1....0..1....2..2....2..2....3..1....2..1
..2..2....1..3....2..1....0..0....3..3....2..2....1..0....1..0....2..2....3..1
CROSSREFS
Column 1 of A233682.
Sequence in context: A131683 A066134 A233682 * A005911 A130566 A233792
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2013
STATUS
approved