OFFSET
0,3
COMMENTS
This automorphism permutes the top-level of a list of even length (1 ... 2n) as (1 3 5 2n-1 ... 2n 2n-2 ... 4 2) and when applied to a list of odd length (1 .. 2n+1), permutes it as (1 3 5 2n-1 2n+1 2n 2n-2 ... 4 2).
LINKS
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 16 2007
STATUS
approved