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 A049367 #18 May 06 2021 21:23:56 %S A049367 1,2,3,7,14,37,102,367,1532,8091,50775,372417,3045985,26989204, %T A049367 252934543 %N A049367 Number of triangle-free planar graphs with n nodes. %H A049367 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 9766535. %Y A049367 Cf. A049368 (inverse Euler transform), A006785. %K A049367 nonn,nice,hard,more %O A049367 1,2 %A A049367 _Brendan McKay_ %E A049367 a(12)-a(15) added using tinygraph by _Falk Hüffner_, May 09 2019