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A229531
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Number of defective 3-colorings of an n X 5 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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16, 112, 1588, 19276, 221096, 2451728, 26566266, 283010776, 2975590424, 30959068528, 319352065652, 3270635802440, 33292532186562, 337120240897408, 3398161294369868, 34116704260522692, 341314436219045264
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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) = 28*a(n-1) - 286*a(n-2) + 1290*a(n-3) - 2373*a(n-4) + 304*a(n-5) + 3551*a(n-6) - 2846*a(n-7) - 546*a(n-8) + 1308*a(n-9) - 505*a(n-10) + 76*a(n-11) - 4*a(n-12) for n > 13.
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EXAMPLE
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Some solutions for n=4:
0 1 2 1 0 0 1 2 1 2 0 1 2 1 2 0 1 0 2 0
0 1 2 0 2 2 1 2 1 2 2 1 0 1 0 2 1 2 1 0
2 1 2 1 2 2 1 2 1 0 0 1 2 1 2 0 1 0 1 0
2 0 2 1 2 2 1 2 0 2 2 0 2 1 0 2 1 0 1 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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