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 A163363 #14 Jan 10 2021 02:12:56 %S A163363 1,4,2,5,3,15,6,8,14,16,59,7,9,13,17,60,58,10,12,18,20,61,57,55,11,31, %T A163363 19,21,64,62,56,54,32,30,24,22,65,63,51,53,33,29,25,23,235,66,68,50, %U A163363 52,34,36,28,26,234,236,79,67,69,49,47,35,37,27,231,233,237,80,78,72 %N A163363 Hilbert curve in N X N grid, one-based, starting downwards from the top-left corner. %H A163363 Antti Karttunen, <a href="/A163363/b163363.txt">Table of n, a(n) for n = 1..32896</a> %H A163363 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A163363 a(n) = A163359(n-1) + 1. %Y A163363 Inverse: A163364. Transpose: A163361. %K A163363 nonn,tabl %O A163363 1,2 %A A163363 _Antti Karttunen_, Jul 29 2009