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A032071
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Number of reversible strings with n labeled beads of 4 colors, no palindromes of more than 1 bead.
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0
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4, 12, 144, 2880, 57600, 1451520, 40642560, 1316044800, 47377612800, 1900678348800, 83629847347200, 4017175658496000, 208893134241792000, 11700158011224883200, 702009480673492992000
(list; graph; refs; listen; history; internal format)
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