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 A130425 #8 Sep 16 2015 12:28:55
%S A130425 1,3,19,107,1471,164059,65442581,26560388929,10901416818161,
%T A130425 4504891039128649,20562691778919031051,94108143760454361244249,
%U A130425 5609165278757040127506253363,334755533004517896353486403105731
%N A130425 a(n) = numerator of Sum_{k=1..n} 1/k^(n+1-k).
%t A130425 Table[Numerator[Sum[1/k^(n + 1 - k), {k, 1, n}]], {n, 1, 20}] (* _Stefan Steinerberger_, May 30 2007 *)
%Y A130425 Cf. A130426, A003101.
%K A130425 frac,nonn
%O A130425 1,2
%A A130425 _Leroy Quet_, May 26 2007
%E A130425 More terms from _Stefan Steinerberger_, May 30 2007