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A319283
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Number of nodes of the backtrack tree for the n queens problem.
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1
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1, 2, 3, 6, 17, 54, 153, 552, 2057, 8394, 35539, 166926, 856189, 4674890, 27358553, 171129072, 1141190303, 8017021932, 59365844491, 461939618824
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