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.
%I A250743 #7 Nov 27 2014 17:13:53 %S A250743 1,1,6,24,150,720,1560,87360,1670760,20420400,1999157160,13085392320, %T A250743 3302971111440,103154328557280,1348374437570160,67598505136850688, %U A250743 114701988497522458032,2307534121538392979232,10183789060049355548733936 %N A250743 Numerator of the harmonic mean of the first n positive Fibonacci numbers. %H A250743 Colin Barker, <a href="/A250743/b250743.txt">Table of n, a(n) for n = 1..120</a> %e A250743 a(4) = 24 because the first 4 positive Fibonacci numbers are [1,1,2,3], and 4/(1/1+1/1+1/2+1/3) = 24/17. %o A250743 (PARI) s=vector(30); f=Vec(x/(1-x-x^2)+O(x^(#s+1))); n=d=0; for(k=1, #s, n++; d+=1/f[k]; s[k]=numerator(n/d)); s %Y A250743 Cf. A000045 (Fibonacci numbers), A250744 (denominators). %K A250743 nonn,frac %O A250743 1,3 %A A250743 _Colin Barker_, Nov 27 2014