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A234476
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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 (constant-stress 1 X 1 tilings).
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1
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672, 7840, 95872, 1200640, 15217152, 194145280, 2484815872, 31866634240, 408975286272, 5252589690880, 67463932444672, 866817120010240, 11135790843297792, 143096049577492480, 1838434738592284672
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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) = 224*a(n-2) -10304*a(n-4) +96256*a(n-6) -80640*a(n-8).
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EXAMPLE
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Some solutions for n=3:
4 5 3 1 5 3 4 4 6 6 7 6 2 2 1 0 1 3 3 2
1 3 7 4 1 0 2 3 0 1 1 1 6 7 2 0 5 6 5 3
3 6 5 3 1 1 3 5 2 2 4 5 3 5 1 0 3 3 1 0
1 3 6 5 5 4 6 7 4 5 2 2 5 6 3 1 0 1 5 3
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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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