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A229537
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Number of defective 3-colorings of a 4 X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.
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1
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0, 84, 356, 3064, 19276, 130854, 833108, 5305746, 33122792, 205196216, 1258781344, 7670081250, 46440194380, 279724889174, 1677103031212, 10014905982560, 59591710277588, 353467715910526, 2090642805771012, 12333845570879546
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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) = 6*a(n-1) + 23*a(n-2) - 102*a(n-3) - 288*a(n-4) + 250*a(n-5) + 787*a(n-6) - 238*a(n-7) - 741*a(n-8) + 124*a(n-9) + 196*a(n-10) - 16*a(n-11) - 16*a(n-12) for n > 14.
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EXAMPLE
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Some solutions for n=4:
0 1 0 1 0 1 0 2 0 1 0 1 0 1 0 1 0 1 0 2
0 1 0 2 2 1 0 1 0 2 0 2 2 1 0 1 0 1 0 1
0 2 1 2 0 2 0 1 1 2 1 2 0 1 0 1 2 1 0 2
1 2 1 0 0 2 0 2 0 2 0 0 2 2 0 2 0 2 0 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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