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 A096361 #6 Aug 01 2020 17:37:36 %S A096361 1,2,3,12,20,72,168,528,1440,4480,13046,40008,120055,366324,1109745, %T A096361 3380752,10269819,31253904,95011267,288979680,878550498,2671223720, %U A096361 8120041693,24682865208,75020015675,227999634772,692872971246,2105464666676 %N A096361 Total number of triangles in all polyiamonds with n triangles. %H A096361 S. T. Coffin, <a href="https://johnrausch.com/PuzzlingWorld/chap02.htm#fig024">The Puzzling World of Polyhedral Dissections</a>, Chap 2, Table 1. %Y A096361 a(n) = n*A000577(n). %K A096361 nonn %O A096361 1,2 %A A096361 _N. J. A. Sloane_, Aug 04 2004