cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

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

Original entry on oeis.org

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

Views

Author

Clark Kimberling, Jun 28 2011

Keywords

Comments

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

Crossrefs

Cf. A192232, A192313.

Programs

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]

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

Original entry on oeis.org

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

Views

Author

Clark Kimberling, Jun 28 2011

Keywords

Comments

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

Crossrefs

Cf. , A192232, A192313, A192338.

Programs

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]
Showing 1-2 of 2 results.

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