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 A230656 #5 Oct 30 2013 04:30:47 %S A230656 1,2,5,21,34,186,454,1927,2746,11128,30906,70762,349068,830170, %T A230656 2278644,13219495,27373350,87615127 %N A230656 Position of the circles with center at a lattice point that contain record numbers of lattice points, in the list of Loeschian numbers A003136. %F A230656 a(n) = k for which A230655(n) = A003136(k). %e A230656 a(3) = 21 because A230655(3) = A003136(21) = 49. %Y A230656 Cf. A003136 (Loeschian numbers), A230655, A075880 (similar sequence for square lattice) %K A230656 nonn,more %O A230656 0,2 %A A230656 _Hugo Pfoertner_, Oct 27 2013