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 A320938 #11 Oct 30 2018 04:37:57 %S A320938 10,5,1,2,7,3,8,4,9,6,32,11,33,12,36,38,41,13,43,14,97,48,49,15,51,52, %T A320938 53,34,56,16,57,17,98,50,58,59,60,18,61,35,62,19,63,20,64,65,66,21,67, %U A320938 37,69,39,70,22,71,72,73,40,74,23,75,24,99,42,76,77,78 %N A320938 Inverse to A321128. %H A320938 Rémy Sigrist, <a href="/A320938/b320938.txt">Table of n, a(n) for n = 0..9999</a> %e A320938 A321128(42) = 63, hence a(63) = 42. %Y A320938 Cf. A321128. %K A320938 nonn,base %O A320938 0,1 %A A320938 _Rémy Sigrist_, Oct 28 2018