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 A136368 #11 Sep 08 2022 08:45:32
%S A136368 1,5,161,6989,889769,145034861,42816875729,15196271678069,
%T A136368 8132911703794601,6790008314246422541,6567054920481119894801,
%U A136368 8950073675937467308565669,15100141203716305943432625689
%N A136368 Numerator of Sum_{k=1..n} (-1)^(k+1)/prime(k)^2.
%t A136368 Table[Numerator[Sum[(-1)^(k+1)/Prime[k]^2, {k, 1, n}]], {n, 1, 20}]
%o A136368 (Magma) [Numerator(&+[(-1)^(k+1)/NthPrime(k)^2:k in [1..n]]): n in [1..13]]; // _Marius A. Burtea_, Aug 26 2019
%Y A136368 Cf. A136369, A136365, A136366, A024530, A136370, A136371.
%K A136368 nonn,frac
%O A136368 1,2
%A A136368 _Alexander Adamchuk_, Dec 27 2007