OFFSET
0,2
COMMENTS
Note: a 0 step counts as a visit and a step but does not contribute to the length of the walk.
FORMULA
G.f.: (1+x^2+x^3-x^5)/(1-2*x-x^2+2*x^3-x^4+x^6).
MATHEMATICA
CoefficientList[Series[ (1+x^2+x^3-x^5)/(1-2*x-x^2+2*x^3-x^4+x^6) , {x, 0, 45}], x]
CROSSREFS
KEYWORD
nonn,easy,walk
AUTHOR
David Scambler, May 22 2012
STATUS
approved