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A233678
Number of (n+1) X (4+1) 0..3 arrays with every 2 X 2 subblock having the sum of the squares of the edge differences equal to 6.
1
2440, 23568, 216592, 2442208, 25036784, 289389648, 3057995568, 35239626640, 377551693872, 4321333099024, 46708511630640, 531289387089424, 5779703369824304, 65409280729909520, 715049970687872816
OFFSET
1,1
COMMENTS
Column 4 of A233682.
FORMULA
Empirical recurrence of order 45 (see link above).
EXAMPLE
Some solutions for n=2:
..3..2..3..2..1....3..1..1..2..1....1..2..1..2..1....2..3..2..3..3
..1..2..1..2..3....3..2..0..0..1....3..2..0..0..1....2..1..2..1..2
..3..2..3..2..1....1..2..1..2..2....1..1..1..2..1....3..1..3..3..3
CROSSREFS
Sequence in context: A253835 A253929 A233912 * A252554 A259007 A259000
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2013
STATUS
approved