OFFSET
0,3
LINKS
FORMULA
G.f. x*(-1+2*x) / ( -1+5*x-4*x^2+x^3 ). a(n) = A012814(n)-2*A012814(n-1). - R. J. Mathar, Sep 20 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved