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 A030570 #6 Jan 20 2024 16:51:28 %S A030570 2,10,19,21,22,23,25,27,29,34,46,58,72,90,103,106,108,109,112,115,118, %T A030570 126,144,162,176,179,180,182,185,188,191,194,197,198,200,203,206,209, %U A030570 211,212,214,215,216,217,218,220,221,223,224 %N A030570 Position of n-th 2 in A030567. %Y A030570 Cf. A030567. %K A030570 nonn %O A030570 1,1 %A A030570 _Clark Kimberling_