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 A331703 #4 Jan 27 2020 11:29:21 %S A331703 1,2,7,14,15,13,21,28,19,40,159,79,56,47,27,36,33,58,64,81,68,90,60, %T A331703 85,83,132,170,107,127,80,114,55,51,109,191,152,134,171,202,192,164, %U A331703 138,513,96,97,166,129,126,377,651,369,95,351,232,530,244,137,110 %N A331703 Index of first occurrence of n in A328294, or 0 if n never appears. %Y A331703 Cf. A328294, A171862. %K A331703 nonn %O A331703 1,2 %A A331703 _Robin Powell_, Jan 25 2020