OFFSET
1,2
COMMENTS
After 5 steps enters a cycle of length 9.
LINKS
N. J. A. Sloane and others, Sequences of RADD type, OEIS wiki.
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 1).
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Luc Stevens (lms022(AT)yahoo.com), May 08 2006
EXTENSIONS
a(20) corrected by Georg Fischer, Jun 11 2019
STATUS
approved