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 A338992 #43 Jun 21 2022 11:06:49 %S A338992 0,6,6,12,12,6,12,6,12,12,12,12,18,12,12,6,12,12,12,12,24,12,6,12,12, %T A338992 12,6,12,12,24,12,12,12,12,12,18,12,12,12,12,18,12,12,12,24,12,12,12, %U A338992 12,24,6,24,12,12,12,12,6,12,24,12,12,12,12,12,12,12,24,12,18 %N A338992 Number of vertices of a hexagonal tessellation that lie on subsequent circles centered at the center of one hexagon. %C A338992 Radii of these circles are square roots of A202822. %C A338992 This is A217219 with zeros dropped, except for a(0). - _Andrey Zabolotskiy_, Jun 21 2022 %H A338992 Szymon Lukaszyk, <a href="https://github.com/szluk/Graphene/blob/main/gr_circles.m">MATLAB script</a> %H A338992 Szymon Lukaszyk, <a href="https://www.researchgate.net/publication/345982332_A_short_note_about_the_geometry_of_graphene">A short note about the geometry of graphene</a>, ResearchGate, (2020). %H A338992 Szymon Lukaszyk, <a href="/A338992/a338992_1.pdf">Illustration of the subsequent 36 radii around a hex center</a>. %Y A338992 Cf. A202822, A217219, A338947 (similar but with circles centered at a vertex of one hexagon). %K A338992 nonn %O A338992 0,2 %A A338992 _Szymon Lukaszyk_, Nov 17 2020