A032070 Number of reversible strings with n labeled beads of 3 colors, no palindromes of more than 1 bead.

3, 6, 54, 864, 12960, 252720, 5307120, 130636800, 3527193600, 106697606400, 3521021011200, 127105948569600, 4957131994214400, 208390202679859200, 9377559120593664000, 450260112212951040000

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 * A355637 A066569 A051641

Adjacent sequences: A032067 A032068 A032069 * A032071 A032072 A032073

Keyword

nonn

Author

Christian G. Bower

Status

approved