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 A028496 #13 Feb 12 2023 06:03:26 %S A028496 1,2,2,4,2,6,4,6,4,12,4,12 %N A028496 Erroneous version of A152455. %C A028496 Original title: Lowest dimension in which rotational symmetry of order n is possible for an infinite regular set of points. %C A028496 The value a(11)=12 in Goodman and O'Rourke is incorrect. - _Sean A. Irvine_, Feb 02 2020 %D A028496 J. E. Goodman and J. O'Rourke, editors, Handbook of Discrete and Computational Geometry, CRC Press, 1997, p. 935. %K A028496 dead %O A028496 2,2 %A A028496 _N. J. A. Sloane_