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 A163538 #3 Mar 31 2012 13:21:18 %S A163538 0,1,0,-1,0,0,1,0,1,0,1,0,0,-1,0,1,1,0,1,0,1,1,0,-1,0,1,0,-1,-1,0,-1, %T A163538 0,0,0,1,0,1,1,0,-1,0,1,0,-1,-1,0,-1,0,-1,-1,0,1,0,0,-1,0,-1,0,-1,0,0, %U A163538 1,0,-1,0,0,1,0,1,1,0,-1,0,1,0,-1,-1,0,-1,0,0,1,0,-1,0,0,1,0,1,0,1,0 %N A163538 The change in X-coordinate when moving from the n-1:th to the n-th term in the type I Hilbert's Hamiltonian walk A163357. %H A163538 A. Karttunen, <a href="/A163538/b163538.txt">Table of n, a(n) for n = 0..65536</a> %F A163538 a(0)=0, a(n) = A059253(n) - A059253(n-1). %Y A163538 These are the first differences of A059253. See also: A163539, A163540, A163542. %K A163538 sign %O A163538 0,1 %A A163538 _Antti Karttunen_, Aug 01 2009