OFFSET
0,3
LINKS
FORMULA
G.f.: ((z+z^3)/(1-4*z+4*z^2-2*z^3)).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Richard Choulet, Apr 03 2009
EXTENSIONS
Definition corrected by Paolo P. Lava, Apr 06 2009
More terms from Vincenzo Librandi, Jun 30 2009
STATUS
approved