Number of defective 3-colorings of an n X n 0..2 array connected diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.

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`%I #9 Apr 27 2021 21:03:46
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`%S 0,6,480,50112,9854784,4032737280,3594819388032,7178082866740800,
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`%T 32598674667546519744,340101114114677727107520,
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`%U 8206049057729134245814363392
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`%N Number of defective 3-colorings of an n X n 0..2 array connected diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.
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`%C Diagonal of A229510.
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`%e Some solutions for n=3:
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`%e 0 1 2 0 1 2 0 0 0 0 0 1 0 1 2 0 1 2 0 1 0
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`%e 0 0 0 2 1 1 1 2 2 1 0 2 2 2 2 0 1 2 2 2 2
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`%e 1 2 1 0 0 2 1 1 1 2 0 2 1 0 0 1 1 0 2 1 1
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`%Y Cf. A229510.
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`%K nonn
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`%O 1,2
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`%A _R. H. Hardin_, Sep 25 2013
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