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A234820
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Number of (n+1) X (5+1) 0..6 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant-stress 1 X 1 tilings).
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1
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34092, 68570, 131704, 325424, 747192, 2099300, 5474032, 16726940, 47728392, 154893260, 471526864, 1601774924, 5115035592, 18006947180, 59642099152, 215979342860, 736198441032, 2726527920620, 9510472646224, 35856810528524
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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) = 8*a(n-1) +60*a(n-2) -620*a(n-3) -1210*a(n-4) +20740*a(n-5) +1580*a(n-6) -392180*a(n-7) +353267*a(n-8) +4606324*a(n-9) -7135240*a(n-10) -34677440*a(n-11) +72387960*a(n-12) +165390560*a(n-13) -443380480*a(n-14) -464032320*a(n-15) +1696321584*a(n-16) +566607168*a(n-17) -3948347520*a(n-18) +465384960*a(n-19) +5084985600*a(n-20) -2142028800*a(n-21) -2757888000*a(n-22) +1741824000*a(n-23).
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EXAMPLE
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Some solutions for n=3:
1 4 0 6 3 6 6 2 6 4 0 1 5 2 6 3 5 1 4 0 6 1 5 2
3 0 2 2 5 2 0 2 0 4 6 1 0 3 1 4 0 2 2 4 4 5 3 6
1 4 0 6 3 6 6 2 6 4 0 1 4 1 5 2 4 0 4 0 6 1 5 2
4 1 3 3 6 3 0 2 0 4 6 1 0 3 1 4 0 2 1 3 3 4 2 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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