OFFSET
1,2
LINKS
Sean A. Irvine, Java program (github)
EXAMPLE
Let "r" denote rotation and "x" an exchange.
For n = 5, the shortest sequence reversing "ABCDE" has length A048200(5) = 10, the only sequence doing so is "xrrxrrxrxr", so a(5) = 1.
For n = 6, we have A048200(6) = 15, but there are 2 solutions of this length "xrxrrxrxrrxrrrx" and "rxrrxrxrrxrxrrx", so a(6) = 2.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Naohiro Nomoto, May 16 2001
EXTENSIONS
Sequence revised and a(9)-a(12) from Sean A. Irvine, Feb 21 2023
STATUS
approved