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Search: id:A068254
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| A068254 |
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1/4 the number of colorings of an n X n square array with 4 colors. |
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1
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| 1, 21, 2403, 1500183, 5110723191, 95013316876491, 9639473169171326643, 5336900216006709884938623
(list; graph; listen)
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