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 A338583 #6 Dec 01 2020 17:10:09 %S A338583 1,2,3,10,29,94,343,1291,5206,22061,96908,439837,2053916,9841412, %T A338583 48319944,242857491,1248629027,6563581656,35258560001,193463945790 %N A338583 Number of unlabeled 3-connected nonplanar graphs with n edges. %H A338583 Hugo Pfoertner, <a href="/A338583/a338583.pdf">Illustrations of terms a(9) - a(12)</a>. %F A338583 a(n) = A338511(n) - A002840(n). %F A338583 a(n) <= A338593(n). The difference A338584(n) = A338593(n)-a(n) are the counts of nonplanar connected graphs with minimum degree 3 at each node that are not 3-connected. %Y A338583 Cf. A002840, A006290, A337517, A338197, A338511, A338573, A338584, A338593, A338594, A338604. %K A338583 nonn,more %O A338583 9,2 %A A338583 _Hugo Pfoertner_, Nov 21 2020