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A229668
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Number of defective 4-colorings of an n X 4 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.
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1
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3, 652, 19805, 328160, 4331928, 50919512, 557478448, 5814322288, 58526242224, 573293485312, 5495680088320, 51763989177088, 480493519118080, 4405407183929600, 39966207303657728, 359270403366182912
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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) = 36*a(n-1) - 552*a(n-2) + 4812*a(n-3) - 27168*a(n-4) + 107904*a(n-5) - 316720*a(n-6) + 703296*a(n-7) - 1187712*a(n-8) + 1506368*a(n-9) - 1379328*a(n-10) + 835584*a(n-11) - 262144*a(n-12) for n > 14.
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EXAMPLE
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Some solutions for n=3:
0 1 0 0 0 1 2 1 0 1 2 3 0 1 2 3 0 1 2 3
2 3 2 1 2 2 0 2 0 3 1 0 3 0 0 2 2 3 0 2
0 0 3 2 0 1 3 0 2 0 3 3 2 1 2 0 1 0 1 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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