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 A269110 #12 Apr 27 2023 11:23:16 %S A269110 1,3,5,6,9,10,14,15,20,21 %N A269110 Numbers of unit circles packed in a triangle of smallest area admitting an equilateral triangle solution. %H A269110 Erich Friedman, <a href="https://erich-friedman.github.io/packing/cirinttt/">Circles in Arbitrary Triangles</a> %Y A269110 May be related to A117142. %Y A269110 For packing into equilateral triangles, see A337019. %K A269110 nonn,hard,more %O A269110 1,2 %A A269110 _Leonid Broukhis_, Feb 19 2016