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 A072152 #13 Nov 18 2012 12:34:32 %S A072152 1,3,4,6,8,8,10,14,16,17,20,23,22,22,28,32,30,31,36,37,36,40,46,46,44, %T A072152 47,50,51,54,58,60,60,60,61,64,69,72,72,74,76,74,75,82,87,86,86,90,90, %U A072152 88,93,100,101,100,102,104,104,106,111,114,115,116,116,118,122 %N A072152 Coordination sequence for VPl-5 structure with respect to node (X) where 18-gon and two squares meet. %C A072152 There are two types of nodes in this structure. %C A072152 The coordination sequence with respect to a particular node gives the number of nodes that can be reached from that node in n steps along edges. %H A072152 Joseph Myers, <a href="/A072152/b072152.txt">Table of n, a(n) for n = 0..1000</a> %H A072152 M. E. Davis, <a href="http://dx.doi.org/10.1038/nature00785">Ordered porous materials for emerging applications</a>, Nature, 417 (Jun 20 2002), 813-821 (gives structure). %H A072152 N. J. A. Sloane, <a href="/A072152/a072152.gif">VPl-5 structure, after Davis</a> %F A072152 Empirical G.f.: -(x^17+x^16-x^15-2*x^14-2*x^13-2*x^12-4*x^11-5*x^10-5*x^9-5*x^8-7*x^7-6*x^6-4*x^5-4*x^4-4*x^3-2*x^2-2*x-1)/((x-1)^2*(x^2+1)*(x^4+1)*(x^6+x^5+x^4+x^3+x^2+x+1)). [_Colin Barker_, Nov 18 2012] %Y A072152 Cf. A072149-A072154. %K A072152 nonn,easy %O A072152 0,2 %A A072152 _N. J. A. Sloane_, Jun 28 2002 %E A072152 Extended by _Joseph Myers_, Sep 30 2011