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A229639
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Number of defective 3-colorings of a 3 X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.
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1
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0, 39, 244, 1109, 6031, 28448, 136778, 633328, 2905016, 13118016, 58633648, 259523840, 1139461984, 4967050352, 21516000592, 92679568016, 397212173264, 1694694809008, 7200709256752, 30481238674128, 128588345884944
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 9*a(n-1) - 15*a(n-2) - 51*a(n-3) + 96*a(n-4) + 138*a(n-5) - 92*a(n-6) - 60*a(n-7) +4 8*a(n-8) - 8*a(n-9) for n > 12.
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EXAMPLE
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Some solutions for n=3:
0 1 1 0 0 1 0 1 2 0 1 0 0 1 0 0 1 0 0 1 2
2 1 0 1 2 1 0 1 0 1 2 1 2 1 0 2 1 0 0 1 2
2 1 0 1 0 0 1 2 1 1 0 1 1 1 0 1 2 0 1 0 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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