documentclass{article}
usepackage{pgfplots}
begin{document}

begin{tikzpicture}
  begin{axis}[xmin=0, xmax=30, ymin=2, ymax=3]
    addplot[samples at={1,2,...,30}, only marks] expression {<Add Fibonacci sequence here>};
  end{axis}
end{tikzpicture}

end{document}

documentclass[tikz,border=3.14mm]{standalone}
usetikzlibrary{math}
begin{document}

tikzmath{
% Adapted from http://www.cs.northwestern.edu/academics/courses/110/html/fib_rec.html
function fibonacci(n) {
    if n == 0 then {
      return 0;
    } else {
       return fibonacci2(n, 0, 1);
}; };
  function fibonacci2(n, p, q) {
    if n == 1 then {
      return q;
    } else {
      return fibonacci2(n-1, q, p+q);
    };
  };
}
begin{tikzpicture}
foreach X in {0,1,...,8}{
node[circle,fill,label=above:{pgfmathparse{int(fibonacci(X))}
pgfmathresult}] at (X,{fibonacci(X)})  {};}

end{tikzpicture}
end{document}

documentclass[tikz,border=7pt]{standalone}
begin{document}
  tikz
    foreach[
        remember=g as h (initially 1),
        remember=f as g (initially 0),
        evaluate=f using int(g+h)
      ] n in {1,...,7}
      fill[green,draw=black] (n,0) rectangle +(1,f) node[black,scale=2,above left]{f};
end{document}

documentclass[tikz,border=7pt]{standalone}
usepackage{xintexpr}
begin{document}
  begin{tikzpicture}[xscale=.35]
    foreach[
        remember=g as h (initially 1),
        remember=f as g (initially 0)
      ] n in{1,...,30}{
        edeff{thexintexpr g + h relax}
        edefff{thexintfloatexpr f/10000 relax}
        fill[green,draw=black] (n,0) rectangle +(1,ff);
      }
  end{tikzpicture}
end{document}