1,3

For an introduction to reductions of polynomials by substitutions such as x^2->x+1, see A192232.

Table of n, a(n) for n=1..20.

Empirical G.f.: -x^2*(x^2+x-1)/(x^4+6*x^3+x^2-4*x+1). [Colin Barker, Nov 13 2012]

(See A192313.)

Cf. A192232, A192313.

Sequence in context: A033121 A180432 A237930 * A106517 A055217 A097472

Adjacent sequences: A192334 A192335 A192336 * A192338 A192339 A192340

nonn

Clark Kimberling, Jun 28 2011

approved