OFFSET
0,2
FORMULA
G.f.: (1+x^2-x^3)/((1-x)*(1-x-2*x^2+x^4)). - Vladeta Jovovic, Apr 05 2005
EXAMPLE
1=1, 1+1=2, 1+3+2=6; 1+5+4+1=11
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Russell Walsmith, Jan 11 2005
EXTENSIONS
More terms from Vladeta Jovovic, Apr 05 2005
STATUS
approved