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A032070
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Number of reversible strings with n labeled beads of 3 colors, no palindromes of more than 1 bead.
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0
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3, 6, 54, 864, 12960, 252720, 5307120, 130636800, 3527193600, 106697606400, 3521021011200, 127105948569600, 4957131994214400, 208390202679859200, 9377559120593664000, 450260112212951040000
(list; graph; refs; listen; history; internal format)
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