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A032069 Number of reversible strings with n labeled beads of 2 colors, no palindromes of more than 1 bead. 0
2, 2, 12, 144, 1440, 20160, 282240, 4838400, 87091200, 1799884800, 39597465600, 965667225600, 25107347865600, 708585150873600, 21257554526208000, 682919861944320000, 23219275306106880000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..17.

C. G. Bower, Transforms (2)

FORMULA

"BHJ" (reversible, identity, labeled) transform of 2, 0, 0, 0...

n! * A032085.

CROSSREFS

Sequence in context: A087220 A032320 A032227 * A003090 A032152 A032057

Adjacent sequences:  A032066 A032067 A032068 * A032070 A032071 A032072

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified February 21 12:53 EST 2018. Contains 299411 sequences. (Running on oeis4.)