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.

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A145611 Numerator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=2.

Original entry on oeis.org

5, 131, 1327, 148969, 89422, 7869871, 204620705, 32739453941, 556571247527, 42299423848079, 84598851790183, 31132377803126339, 155661889412050564, 3735885348093583561, 216681350219210744683, 429895798848743086730197
Offset: 1

Views

Author

Artur Jasinski, Oct 14 2008

Keywords

Comments

For denominators see A145612. For general properties of A_l(x) see A145609.

Crossrefs

Programs

  • Maple
    A := proc(l,x) add(x^(l-d)/d,d=1..l-1) ; end: A145611 := proc(n) numer( A(2*n+1,2)) ; end: seq(A145611(n),n=1..20) ; # R. J. Mathar, Aug 21 2009
  • Mathematica
    m = 2; aa = {}; Do[k = 0; Do[k = k + m^(2 r + 1 - d)/d, {d, 1, 2 r}]; AppendTo[aa, Numerator[k]], {r, 1, 25}]; aa (* Artur Jasinski, Oct 14 2008 *)
    a[n_,m_]:=Integrate[(m-x^n)/(m-x),{x,0,1}]+(m^n-m)Log[m/(m-1)]
    Table[2 a[2 n, 2] // Simplify  // Numerator, {n,1,25}]  (* Gerry Martens , Jun 04 2016 *)

Extensions

Edited by R. J. Mathar, Aug 21 2009
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