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 A057313 #12 Apr 10 2018 08:26:36 %S A057313 1,4,9,17,30,48,68,87,109,142,184,224,255,287,338,406,470,515,555,620, %T A057313 712,802,865,915,992,1104,1218,1301,1365,1456,1586,1720,1821,1901, %U A057313 2010,2160,2312,2427,2521,2650,2824,2996,3123,3227,3374,3574,3770,3911 %N A057313 Coordination sequence T2 for Zeolite Code SAS. %H A057313 R. W. Grosse-Kunstleve, <a href="/A057313/b057313.txt">Table of n, a(n) for n = 0..1000</a> %H A057313 R. W. Grosse-Kunstleve, <a href="/A005897/a005897.html">Coordination Sequences and Encyclopedia of Integer Sequences</a> %H A057313 Sean A. Irvine, <a href="/A008000/a008000_1.pdf">Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane</a> %H A057313 International Zeolite Association, <a href="http://www.iza-structure.org/databases/">Database of Zeolite Structures</a> %F A057313 G.f.: (1 + x) * (1 + x + 2*x^2 + 4*x^3 + 6*x^4 + 5*x^5 + 6*x^6 + 5*x^7 + 6*x^8 + 4*x^9 + 2*x^10 + x^11 + x^12) / ((1 - x)^3 * (1 - x + x^2) * (1 + x + x^2 + x^3 + x^4)^2). - _Colin Barker_, Dec 20 2015 %K A057313 nonn %O A057313 0,2 %A A057313 _Ralf W. Grosse-Kunstleve_