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 A008224 #25 Apr 10 2018 08:26:35 %S A008224 1,4,9,17,29,45,65,89,117,149,185,225,268,314,364,418,476,538,605,676, %T A008224 750,827,907,991,1078,1169,1264,1362,1464,1570,1680,1794,1913,2036, %U A008224 2161,2289,2421,2557,2697,2842,2992,3145,3301,3460,3622,3788,3958,4132,4309 %N A008224 Coordination sequence T6 for Zeolite Code PAU. %C A008224 For n = 3 to n = 12, a(n) is the sum of two squares separated by 3 (3rd diagonal of A055096). - _Avi Friedlich_, Apr 01 2015 %D A008224 W. M. Meier, D. H. Olson and Ch. Baerlocher, Atlas of Zeolite Structure Types, 4th Ed., Elsevier, 1996 %H A008224 R. W. Grosse-Kunstleve, <a href="/A008224/b008224.txt">Table of n, a(n) for n = 0..1000</a> %H A008224 R. W. Grosse-Kunstleve, <a href="/A005897/a005897.html">Coordination Sequences and Encyclopedia of Integer Sequences</a> %H A008224 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 A008224 Sean A. Irvine, <a href="/A008000/a008000_1.pdf">Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane</a> %H A008224 International Zeolite Association, <a href="http://www.iza-structure.org/databases/">Database of Zeolite Structures</a> %K A008224 nonn %O A008224 0,2 %A A008224 _Ralf W. Grosse-Kunstleve_