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 A065276 #8 Mar 18 2022 21:50:14 %S A065276 2,4,1,8,10,3,5,16,18,20,22,6,9,7,11,32,34,36,38,40,42,44,46,12,17,13, %T A065276 19,14,21,15,23,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,24,33, %U A065276 25,35,26,37,27,39,28,41,29,43,30,45,31,47,128,130,132,134,136,138,140 %N A065276 The inverse permutation to A065275. %H A065276 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %K A065276 nonn %O A065276 1,1 %A A065276 _Antti Karttunen_, Oct 28 2001