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 A049365 #18 Mar 11 2023 07:59:08 %S A049365 1,0,1,1,3,7,21,81,401,2499,18604,158515,1464681,14305475 %N A049365 Number of connected planar graphs with n nodes and even degrees (i.e., that are Eulerian). %C A049365 M. Kirchweger, M. Scheucher, and S. Szeider, SAT-Based Generation of Planar Graphs, in preparation. %Y A049365 Inverse Euler transform of A049339. %K A049365 nonn,nice,more,hard %O A049365 1,5 %A A049365 _Brendan McKay_ %E A049365 a(12) from _Sean A. Irvine_, Jul 30 2021 %E A049365 a(13)-a(14) from _Manfred Scheucher_, Mar 11 2023