A192337 Coefficient of x in the reduction of n-th polynomial at A157751 by x^2->x+1.

0, 1, 3, 10, 31, 95, 286, 853, 2525, 7436, 21815, 63821, 186328, 543165, 1581591, 4601410, 13378731, 38880803, 112954430, 328063121

Offset

1,3

Comments

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

Links

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

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

Cf. A192232, A192313.

Sequence in context: A033121 A180432 A237930 * A106517 A363780 A055217

Adjacent sequences: A192334 A192335 A192336 * A192338 A192339 A192340

Keyword

nonn

Author

Clark Kimberling, Jun 28 2011

Status

approved