OFFSET
1,6
COMMENTS
Presumably a(n)=n/3+o(n)
FORMULA
a(n)=sum(k=1,n,(1-K(k))*(K(k+1)-K(k))) where K(k)=A000002(k).
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Mar 04 2009
STATUS
approved