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 A121151 #9 Feb 16 2025 08:33:02 %S A121151 3,4,5,6,7,7,8,9,10,10,11,12,12,13 %N A121151 Minimal number of vertices in an n-polytrimino (or n-polyiamond). %C A121151 An n-polytrimino is similar to polyomino but it is made with n triangles instead of squares. %H A121151 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polyomino.html">Polyomino</a>. %H A121151 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polyiamond.html">Polyiamond</a>. %Y A121151 Cf. A121149, A121150. %K A121151 nonn,more %O A121151 1,1 %A A121151 _Alexander Adamchuk_, Aug 12 2006