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 A364887 #6 Aug 20 2023 12:13:30 %S A364887 1,2,4,3,7,5,11,6,10,8,16,9,22,12,14,13,29,15,37,17,19,23,46,18,28,30, %T A364887 25,24,56,20,67,21,32,38,35,26,79,47,40,27,92,33,106,31,43,57,121,34, %U A364887 66,36,49,39,137,41,52,42,59,68,154,44,172,80,55,48,62,50 %N A364887 Inverse permutation to A364884. %H A364887 Rémy Sigrist, <a href="/A364887/a364887.gp.txt">PARI program</a> %H A364887 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are pmutations of the natural numbers</a> %e A364887 A364884(42) = 56, hence a(56) = 42. %o A364887 (PARI) See Links section. %Y A364887 Cf. A364884. %K A364887 nonn %O A364887 1,2 %A A364887 _Rémy Sigrist_, Aug 12 2023