OFFSET
1,1
COMMENTS
a(n) also equals the Abelian complexity function of A189718.
LINKS
FORMULA
a(1) = 2; a(3n) = a(n) + 2; a(3n-1) = a(n) + 1; a(3n+1) = a(n) + 1.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Nathan Fox, Mar 12 2013
STATUS
approved