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 A049339 #18 Mar 10 2023 10:08:56 %S A049339 1,1,2,3,6,14,36,121,533,3067,21798,180898,1648907,15977626 %N A049339 Number of n-node planar graphs with even degrees. %D A049339 M. Kirchweger, M. Scheucher, and S. Szeider, SAT-Based Generation of Planar Graphs, in preparation. %Y A049339 Row sums of A049340. %Y A049339 Euler transform of A049365. %K A049339 nonn,nice,hard,more %O A049339 1,3 %A A049339 _Brendan McKay_ %E A049339 a(12) from _Sean A. Irvine_, Jul 30 2021 %E A049339 a(13)-a(14) from _Manfred Scheucher_, Mar 8-10 2023