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 A008020 #14 Apr 10 2018 08:26:35 %S A008020 1,4,9,18,30,43,64,90,111,140,181,215,249,296,342,389,450,511,565,624, %T A008020 690,766,850,927,1003,1088,1172,1262,1368,1471,1566,1669,1779,1892, %U A008020 2011,2132,2256,2384,2510,2642,2784,2925,3067,3214,3364,3521,3680,3838,4007 %N A008020 Coordination sequence T2 for Zeolite Code AFR. %D A008020 W. M. Meier, D. H. Olson and Ch. Baerlocher, Atlas of Zeolite Structure Types, 4th Ed., Elsevier, 1996 %H A008020 R. W. Grosse-Kunstleve, <a href="/A008020/b008020.txt">Table of n, a(n) for n = 0..1000</a> %H A008020 R. W. Grosse-Kunstleve, <a href="/A005897/a005897.html">Coordination Sequences and Encyclopedia of Integer Sequences</a> %H A008020 R. W. Grosse-Kunstleve, G. O. Brunner and N. J. A. Sloane, <a href="http://neilsloane.com/doc/ac96cs/">Algebraic Description of Coordination Sequences and Exact Topological Densities for Zeolites</a>, Acta Cryst., A52 (1996), pp. 879-889. %H A008020 Sean A. Irvine, <a href="/A008000/a008000_1.pdf">Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane</a> %H A008020 International Zeolite Association, <a href="http://www.iza-structure.org/databases/">Database of Zeolite Structures</a> %K A008020 nonn %O A008020 0,2 %A A008020 _Ralf W. Grosse-Kunstleve_