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A223290
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4-loop graph coloring a rectangular array: number of n X 1 0..8 arrays where 0..8 label nodes of a graph with edges 0,1 1,2 2,0 0,3 3,4 4,0 0,5 5,6 6,0 0,7 7,8 8,0 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.
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1
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9, 24, 96, 288, 1056, 3360, 11808, 38688, 133152, 442656, 1507872, 5049120, 17112096, 57505056, 194401824, 654442272, 2209656864, 7445195040, 25122449952, 84684010272, 285663609888, 963135692064, 3248444571168, 10953530107680
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