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 A057309 #11 Apr 10 2018 08:26:36 %S A057309 1,4,12,21,44,74,106,138,172,226,284,337,412,480,552,640,710,813,916, %T A057309 1014,1132,1250,1384,1464,1616,1791,1900,2054,2206,2376,2554,2701, %U A057309 2888,3084,3272,3450,3646,3860,4074,4303,4546,4740,4980,5212,5426,5739 %N A057309 Coordination sequence T6 for Zeolite Code MTF. %H A057309 R. W. Grosse-Kunstleve, <a href="/A057309/b057309.txt">Table of n, a(n) for n = 0..1000</a> %H A057309 R. W. Grosse-Kunstleve, <a href="/A005897/a005897.html">Coordination Sequences and Encyclopedia of Integer Sequences</a> %H A057309 Sean A. Irvine, <a href="/A008000/a008000_1.pdf">Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane</a> %H A057309 International Zeolite Association, <a href="http://www.iza-structure.org/databases/">Database of Zeolite Structures</a> %K A057309 nonn %O A057309 0,2 %A A057309 _Ralf W. Grosse-Kunstleve_