A192339 Coefficient of x in the reduction of n-th polynomial at A157751 by x^2->x+2.

0, 1, 3, 11, 37, 125, 415, 1371, 4501, 14725, 48031, 156355, 508197, 1649933, 5352255, 17351563, 56226389, 182134837

Offset: 1

Author

Clark Kimberling, Jun 28 2011

Keywords

• nonn

Comments

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

Crossrefs

Cf. , A192232, A192313, A192338.

Programs

Mathematica

(See A192338.)

Formula

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