OFFSET
1,1
COMMENTS
It appears that (1) a(n) always exists, (2) a(n) is even, (3) a(n)/n^(5/2) -> infinity. If initial conditions are u(1)=u(2)=1, u(3)=2n+1, then u(k) reaches a 2-cycle for any k>m large enough (cf. A078098) - Benoit Cloitre, Jan 29 2006
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Dec 05 2002
STATUS
approved