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A234905
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Number of (n+1) X (1+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 1, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).
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1
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280, 1720, 10344, 65048, 395992, 2497560, 15235088, 96142104, 586688280, 3702734168, 22596846536, 142617229960, 870368867864, 5493248738432, 33524459064760, 211586539448504, 1291281038431688, 8149802725166840
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OFFSET
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1,1
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LINKS
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FORMULA
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Empirical: a(n) = 55*a(n-2) -725*a(n-4) +3663*a(n-6) -7525*a(n-8) +6335*a(n-10) -1805*a(n-12).
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EXAMPLE
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Some solutions for n=4:
0 2 5 4 5 7 1 0 7 5 5 2 4 0 4 7 1 3 3 1
4 7 7 5 0 3 6 4 2 1 2 0 6 3 3 5 0 1 7 6
1 5 4 3 4 6 3 0 6 4 5 2 2 0 6 7 2 4 2 0
3 6 7 5 1 4 7 3 3 2 2 0 3 2 1 3 0 1 7 4
1 5 5 2 2 6 5 2 6 4 7 6 6 4 4 7 3 5 6 2
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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