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 A309068 #14 Jul 10 2019 10:39:54
%S A309068 1,2,11,362,7954
%N A309068 Least k such that the rank of the elliptic curve y^2 = x^3 - k^2 is n.
%o A309068 (PARI) {a(n) = my(k=1); while(ellanalyticrank(ellinit([0, 0, 0, 0, -k^2]))[1]<>n, k++); k}
%Y A309068 Cf. A031508, A060951, A194687, A309069.
%K A309068 nonn,more
%O A309068 0,2
%A A309068 _Seiichi Manyama_, Jul 10 2019