OFFSET
1,3
COMMENTS
For an introduction to reductions of polynomials by substitutions such as x^2->x+1, see A192232.
FORMULA
Empirical G.f.: -x^2*(x^2+x-1)/(x^4+6*x^3+x^2-4*x+1). [Colin Barker, Nov 13 2012]
MATHEMATICA
(See A192313.)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jun 28 2011
STATUS
approved