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A235083
Number of (n+1) X (4+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).
1
478, 930, 1758, 3558, 7046, 14702, 29970, 63862, 132746, 287122, 605338, 1324402, 2823950, 6237794, 13432462, 29925830, 65041174, 146070222, 320349666, 724993878, 1604290682, 3657668498, 8165829930, 18749536114, 42223278878
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) +4*a(n-2) -87*a(n-3) +90*a(n-4) +450*a(n-5) -830*a(n-6) -936*a(n-7) +2737*a(n-8) +408*a(n-9) -4078*a(n-10) +891*a(n-11) +2766*a(n-12) -816*a(n-13) -904*a(n-14) +180*a(n-15) +120*a(n-16).
EXAMPLE
Some solutions for n=5:
2 0 3 1 4 2 0 1 0 3 2 1 2 1 2 0 3 2 3 0
1 3 2 4 3 1 3 0 3 2 0 3 0 3 0 1 0 3 0 1
2 0 3 1 4 2 0 1 0 3 2 1 2 1 2 0 3 2 3 0
1 3 2 4 3 1 3 0 3 2 1 4 1 4 1 1 0 3 0 1
2 0 3 1 4 2 0 1 0 3 2 1 2 1 2 0 3 2 3 0
1 3 2 4 3 1 3 0 3 2 0 3 0 3 0 1 0 3 0 1
CROSSREFS
Column 4 of A235087.
Sequence in context: A020375 A031788 A252543 * A252544 A252545 A260204
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2014
STATUS
approved