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A032072
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Number of reversible strings with n labeled beads of 5 colors, no palindromes of more than 1 bead.
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0
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5, 20, 300, 7200, 180000, 5580000, 195300000, 7862400000, 353808000000, 17713080000000, 974219400000000, 58468132800000000, 3800428632000000000, 266043625848000000000
(list; graph; refs; listen; history; internal format)
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