A032071 Number of reversible strings with n labeled beads of 4 colors, no palindromes of more than 1 bead.

4, 12, 144, 2880, 57600, 1451520, 40642560, 1316044800, 47377612800, 1900678348800, 83629847347200, 4017175658496000, 208893134241792000, 11700158011224883200, 702009480673492992000

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 * A365310 A222393 A367883

Adjacent sequences: A032068 A032069 A032070 * A032072 A032073 A032074

Keyword

nonn

Author

Christian G. Bower

Status

approved