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 A358140 #12 Nov 03 2022 10:07:22 %S A358140 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,24,21,22,23,25,26, %T A358140 27,28,29,30,31,32,33,34,35,36,40,48,37,38,39,41,42,49,50,43,44,45,46, %U A358140 47,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67 %N A358140 Inverse permutation to A358121. %H A358140 Rémy Sigrist, <a href="/A358140/b358140.txt">Table of n, a(n) for n = 1..8192</a> %H A358140 Rémy Sigrist, <a href="/A358140/a358140.gp.txt">PARI program</a> %H A358140 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A358140 A358121(42) = 43, so a(43) = 42. %o A358140 (PARI) See Links section. %Y A358140 Cf. A358121. %K A358140 nonn,base %O A358140 1,2 %A A358140 _Rémy Sigrist_, Oct 31 2022