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A234445
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Number of (n+1) X (2+1) 0..4 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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1120, 11574, 125080, 1377422, 15269704, 170001402, 1894235272, 21145362278, 235980939816, 2637191479466, 29456411908296, 329449541332294, 3682458023803816, 41215279675356394, 460998785806635720
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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) = 16*a(n-1) +122*a(n-2) -2854*a(n-3) +3035*a(n-4) +114162*a(n-5) -324660*a(n-6) -1581792*a(n-7) +6105836*a(n-8) +6998392*a(n-9) -41646592*a(n-10) +4188416*a(n-11) +100180352*a(n-12) -55355328*a(n-13) -54337536*a(n-14) +19902720*a(n-15) +7110912*a(n-16) -1815552*a(n-17).
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EXAMPLE
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Some solutions for n=3:
2 2 2 2 1 4 2 0 4 1 1 1 2 3 4 2 0 2 1 1 0
2 3 4 2 2 4 1 0 3 4 3 2 2 2 2 2 1 2 4 3 1
2 2 2 3 2 3 2 0 2 3 3 3 2 3 4 0 0 0 1 1 0
2 1 0 2 2 2 4 3 4 3 2 1 3 3 3 2 3 2 4 3 1
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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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