A032071 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

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

(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 * A365310 A222393 A367883

Adjacent sequences: A032068 A032069 A032070 * A032072 A032073 A032074

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved