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A234818
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Number of (n+1) X (3+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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2380, 6282, 15224, 47136, 131704, 443220, 1352816, 4791948, 15484360, 56779452, 190677584, 716514876, 2473383304, 9461029980, 33344399696, 129230455548, 462955104520, 1811799391452, 6576906075344, 25926079006716, 95144821863304
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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=5:
4 3 4 0 5 0 5 0 3 6 3 6 3 6 2 6 3 5 3 5
0 5 0 2 1 2 1 2 4 1 4 1 4 1 3 1 6 2 6 2
4 3 4 0 5 0 5 0 0 3 0 3 3 6 2 6 0 2 0 2
0 5 0 2 3 4 3 4 5 2 5 2 3 0 2 0 4 0 4 0
5 4 5 1 5 0 5 0 1 4 1 4 1 4 0 4 3 5 3 5
0 5 0 2 1 2 1 2 3 0 3 0 3 0 2 0 6 2 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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