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

1,1

LINKS

Table of n, a(n) for n=1..16.

C. G. Bower, Transforms (2)

FORMULA

"BHJ" (reversible, identity, labeled) transform of 3, 0, 0, 0...

n! * A032086.

CROSSREFS

Sequence in context: A067608 A023177 A132474 * A066569 A051641 A003098

Adjacent sequences:  A032067 A032068 A032069 * A032071 A032072 A032073

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified October 22 03:50 EDT 2018. Contains 316431 sequences. (Running on oeis4.)