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 A009943 #15 Apr 10 2018 08:26:36 %S A009943 1,6,24,56,96,152,216,296,384,488,600,728,864,1016,1176,1352,1536, %T A009943 1736,1944,2168,2400,2648,2904,3176,3456,3752,4056,4376,4704,5048, %U A009943 5400,5768,6144,6536,6936,7352,7776,8216,8664,9128,9600,10088,10584 %N A009943 Coordination sequence for NiAs(1), As position. %D A009943 Gmelin Handbook of Inorg. and Organomet. Chem., 8th Ed., 1994, TYPIX search code (194) hP4. %H A009943 Sean A. Irvine, <a href="/A009943/b009943.txt">Table of n, a(n) for n = 0..1000</a> %H A009943 R. W. Grosse-Kunstleve, <a href="/A005897/a005897.html">Coordination Sequences and Encyclopedia of Integer Sequences</a> %H A009943 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 A009943 Sean A. Irvine, <a href="/A008000/a008000_1.pdf">Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane</a> %p A009943 (1+4*x+12*x^2+10*x^3-5*x^4+2*x^5)/(1-x^2)/(1-x)^2; %K A009943 nonn %O A009943 0,2 %A A009943 _Ralf W. Grosse-Kunstleve_