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 A381611 #8 Mar 03 2025 09:33:19 %S A381611 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,25,27, %T A381611 29,24,26,28,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48, %U A381611 49,50,52,54,56,51,53,55,57,58,59,60,61,62,63,64,65,66,67 %N A381611 Inverse permutation to A381610. %H A381611 Rémy Sigrist, <a href="/A381611/b381611.txt">Table of n, a(n) for n = 0..10000</a> %H A381611 Rémy Sigrist, <a href="/A381611/a381611_1.gp.txt">PARI program</a> %H A381611 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A381611 A381610(72) = 70, so a(70) = 72. %o A381611 (PARI) \\ See Links section. %Y A381611 Cf. A381610. %K A381611 nonn,base %O A381611 0,3 %A A381611 _Rémy Sigrist_, Mar 01 2025