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Number of reversible strings with n labeled beads of 3 colors, no palindromes of more than 1 bead.

0

`%I #7 Mar 30 2012 17:37:01
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`%S 3,6,54,864,12960,252720,5307120,130636800,3527193600,106697606400,
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`%T 3521021011200,127105948569600,4957131994214400,208390202679859200,
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`%U 9377559120593664000,450260112212951040000
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`%N Number of reversible strings with n labeled beads of 3 colors, no palindromes of more than 1 bead.
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`%H C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>
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`%F "BHJ" (reversible, identity, labeled) transform of 3, 0, 0, 0...
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`%F n! * A032086.
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`%K nonn
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`%O 1,1
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`%A _Christian G. Bower_
`