OFFSET
1,1
COMMENTS
LINKS
FORMULA
a(n) = A001353(n+1). - R. J. Mathar, Sep 21 2011
Empirical G.f.: x*(4-x)/(1-4*x+x^2). - Colin Barker, Jan 04 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Sep 20 2011
STATUS
approved