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A235285
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Number of (n+1) X (4+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings).
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1
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136, 188, 248, 380, 544, 908, 1400, 2492, 4096, 7628, 13208, 25340, 45664, 89228, 165560, 326972, 619456, 1230668, 2366168, 4715900, 9162784, 18292748, 35811320, 71557052, 140857216, 281583308, 556527128, 1112792060, 2205927904, 4411331468
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 3*a(n-1) +3*a(n-2) -15*a(n-3) +4*a(n-4) +18*a(n-5) -12*a(n-6).
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EXAMPLE
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Some solutions for n=4:
1 0 1 0 1 0 1 0 1 0 3 0 2 0 2 1 2 0 3 0
0 3 0 3 0 3 0 3 0 3 1 2 0 2 0 3 0 2 1 2
2 1 2 1 2 2 3 2 3 2 3 0 2 0 2 1 2 0 3 0
0 3 0 3 0 3 0 3 0 3 2 3 1 3 1 3 0 2 1 2
2 1 2 1 2 0 1 0 1 0 3 0 2 0 2 1 2 0 3 0
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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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