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 A049368 #7 May 09 2019 14:52:38 %S A049368 1,1,1,3,6,18,55,230,1063,6161,41004,312782,2618995,23549346,222764216 %N A049368 Number of connected triangle-free planar graphs with n nodes. %H A049368 F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 9766535. %K A049368 nonn,nice,hard %O A049368 1,4 %A A049368 _Brendan McKay_ %E A049368 a(12)-a(15) added using tinygraph by _Falk Hüffner_, May 09 2019