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 A030490 #6 Jun 14 2025 19:46:57 %S A030490 8,10,14,16,18,21,26,31,33,37,43,46,50,55,57,61,67,70,72,76,80,84,88, %T A030490 92,99,102,107,110,113,117,122,127,133,139,143,149,151,156,161,166, %U A030490 171,176,183,189,192,197,204,208,213,219,222,227 %N A030490 Position of n-th 3 in A030298. %Y A030490 Cf. A030298. %K A030490 nonn %O A030490 1,1 %A A030490 _Clark Kimberling_