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 A257472 #11 Mar 22 2022 00:11:44 %S A257472 1,2,3,4,6,5,11,7,8,9,22,10,30,14,12,13,49,15,59,16,17,27,84,18,19,35, %T A257472 23,20,125,21,142,24,31,54,25,26,195,66,40,28,233,29,255,36,32,92,302, %U A257472 33,34,37,60,45,377,38,41,39,72,135,459,42,486,151,43,44,50,46,580,67 %N A257472 Inverse permutation to A257471. %H A257472 Ivan Neretin, <a href="/A257472/b257472.txt">Table of n, a(n) for n = 1..10000</a> %H A257472 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A257472 Cf. A003991 (multiplication table), A257471 (inverse permutation). %K A257472 nonn %O A257472 1,2 %A A257472 _Ivan Neretin_, Apr 25 2015