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 A072153 #16 Jan 09 2025 08:01:28 %S A072153 1,3,5,6,7,9,11,13,16,19,20,20,22,25,27,29,32,34,34,35,38,41,43,45,47, %T A072153 48,49,51,54,57,59,60,61,63,65,67,70,73,74,74,76,79,81,83,86,88,88,89, %U A072153 92,95,97,99,101,102,103,105,108,111,113,114,115,117,119,121,124 %N A072153 Coordination sequence for VPl-5 structure with respect to node (Y) where 18-gon, hexagon and square meet. %C A072153 There are two types of nodes in this structure. %C A072153 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 A072153 Joseph Myers, <a href="/A072153/b072153.txt">Table of n, a(n) for n = 0..1000</a> %H A072153 M. E. Davis, <a href="https://doi.org/10.1038/nature00785">Ordered porous materials for emerging applications</a>, Nature, 417 (Jun 20 2002), 813-821 (gives structure). %H A072153 N. J. A. Sloane, <a href="/A072152/a072152.gif">VPl-5 structure, after Davis</a> %F A072153 Empirical G.f.: (x^2+x+1)^2*(x^6+x^3+1)/((x-1)^2*(x^2+1)*(x^6+x^5+x^4+x^3+x^2+x+1)). [_Colin Barker_, Nov 18 2012] %Y A072153 Cf. A072149, A072150, A072151, A072152, A072154. %K A072153 nonn,easy %O A072153 0,2 %A A072153 _N. J. A. Sloane_, Jun 28 2002 %E A072153 Extended by _Joseph Myers_, Sep 30 2011