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 A129680 #13 Sep 24 2020 03:32:57
%S A129680 2,-1,2,0,1,-4,2,-1,1,2,0,-4,2,-1,2,0,1,2,0,-6,2,-1,1,-2,2,-1,2,0,1,
%T A129680 -4,2,-1,1,2,0,-4,2,-1,1,-2,2,-1,2,0,1,2,0,-6,2,-1,2,0,1,-4,2,-1,1,2,
%U A129680 0,-4,2,-1,2,0,1,2,0,-6,2,-1,1,-2,2,-1,2,0,1,2,0,-6,2,-1,2,0,1,-4,2,-1,1,2,0,-4,2,-1,1,-2,2,-1,2
%N A129680 Distance sequence of A129676: A129676(n)-n.
%C A129680 The numbers in this sequence seem to be in range [-6,2], but they are never -3 nor -5 (tested up to 10^4). The relative density of the values {-6,-4,-2,-1,0,1,2} asymptotically is {1,2,1,4,4,4,8}.
%H A129680 Michael De Vlieger, <a href="/A129680/b129680.txt">Table of n, a(n) for n = 1..10000</a>
%H A129680 Jean-François Fortin, Wen-Jie Ma, Witold Skiba, <a href="https://arxiv.org/abs/2006.13964">Seven-Point Conformal Blocks in the Extended Snowflake Channel and Beyond</a>, arXiv:2006.13964 [hep-th], 2020.
%Y A129680 Distance of A129676, Cf. A129678, A129679, A129681 and A000069.
%K A129680 sign
%O A129680 1,1
%A A129680 Ferenc Adorjan (fadorjan(AT)freemail.hu or ferencadorjan(AT)gmail.com), May 01 2007