OFFSET
1,1
LINKS
FORMULA
Empirical g.f.: x*(5+8*x-9*x^2-12*x^3+x^4)/(1-5*x^2+5*x^4). [Colin Barker, Sep 02 2012]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Joseph Myers, Dec 24 2008
STATUS
approved