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 A030344 #6 Apr 26 2023 09:48:03 %S A030344 2,7,10,12,13,14,21,30,34,37,39,40,44,47,48,50,53,56,57,59,61,62,64, %T A030344 65,66,67,68,77,89,94,98,101,102,113,125,130,134,137,138,143,147,149, %U A030344 151,155,159,161,163,166,167,170,171,173,174,175 %N A030344 Position of n-th 2 in A030341. %Y A030344 Cf. A030341. %K A030344 nonn %O A030344 1,1 %A A030344 _Clark Kimberling_