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

1,1

LINKS

Table of n, a(n) for n=1..15.

C. G. Bower, Transforms (2)

FORMULA

"BHJ" (reversible, identity, labeled) transform of 4, 0, 0, 0...

n! * A032087.

CROSSREFS

Sequence in context: A077611 A052598 A230691 * A222393 A213143 A173603

Adjacent sequences:  A032068 A032069 A032070 * A032072 A032073 A032074

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified October 16 12:34 EDT 2018. Contains 316263 sequences. (Running on oeis4.)