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A032070
Number of reversible strings with n labeled beads of 3 colors, no palindromes of more than 1 bead.
+0
1
3, 6, 54, 864, 12960, 252720, 5307120, 130636800, 3527193600, 106697606400, 3521021011200, 127105948569600, 4957131994214400, 208390202679859200, 9377559120593664000, 450260112212951040000
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
AT&T Labs Research
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