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A056321
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Number of primitive (aperiodic) reversible strings with n beads using exactly five different colors.
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1
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0, 0, 0, 0, 60, 900, 8400, 63000, 417120, 2551500, 14804700, 82764000, 450518460, 2404502100, 12646078140, 65771433000, 339165516120, 1737485731740, 8855359634100, 44952365429940, 227475768899460
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