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A235020
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Number of (n+1) X (2+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 3, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).
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1
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332, 1200, 4312, 15572, 56276, 203768, 738516, 2680636, 9738960, 35432228, 129023908, 470470536, 1717000260, 6274522924, 22948524144, 84039182132, 308005315508, 1130228790408, 4150565943156, 15260094453244, 56146361267440
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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) = 5*a(n-1) +40*a(n-2) -213*a(n-3) -616*a(n-4) +3529*a(n-5) +4898*a(n-6) -29657*a(n-7) -24043*a(n-8) +140862*a(n-9) +80302*a(n-10) -394226*a(n-11) -183852*a(n-12) +650340*a(n-13) +268328*a(n-14) -614608*a(n-15) -222048*a(n-16) +318656*a(n-17) +91776*a(n-18) -82432*a(n-19) -14336*a(n-20) +8192*a(n-21).
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EXAMPLE
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Some solutions for n=4:
0 1 3 4 0 4 4 2 3 4 2 1 0 2 1 5 1 0 3 1 5
1 5 4 3 2 3 5 0 4 2 3 5 4 3 5 3 2 4 1 2 3
0 1 3 4 0 4 4 2 3 4 2 1 5 1 0 1 3 2 2 0 4
4 2 1 3 2 3 2 3 1 0 1 3 1 0 2 2 1 3 1 2 3
0 1 3 2 4 2 3 1 2 4 2 1 3 5 4 0 2 1 3 1 5
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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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