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 A084565 #10 Mar 02 2021 04:53:07 %S A084565 1,1,3,12,79,1123,42065,4880753,1674021742,1612191702946, %T A084565 4291399235883144,31570649902282023158,644451747846907273827686, %U A084565 36675914469877423648734408329,5846124500387959287169919356171145 %N A084565 Number of connected switching classes of signed graphs with n nodes. %C A084565 Also, number of unlabeled connected strength 2 Eulerian graphs with n nodes. - _Vladeta Jovovic_, Mar 14 2009 %D A084565 Bussemaker, F. C.; Cameron, P. J.; Seidel, J. J.; and Tsaranov, S. V., Tables of signed graphs, Report-WSK 91-01, Eindhoven University of Technology, Department of Mathematics and Computing Science, Eindhoven, 1991, 105 pp. MR: 92g:05001. %H A084565 F. C. Bussemaker, P. J. Cameron, J. J. Seidel, and S. V. Tsaranov, <a href="https://www.researchgate.net/publication/241872284_Tables_of_signed_graphs ">Tables of signed graphs</a>, Report-WSK 91-01, Eindhoven University of Technology, Department of Mathematics and Computing Science, Eindhoven, 1991, 105 pp. (MR: 92g:05001). %Y A084565 Cf. A007127, A053465. %K A084565 nonn %O A084565 1,3 %A A084565 _N. J. A. Sloane_, Jul 16 2003 %E A084565 Edited by _N. J. A. Sloane_ Apr 05 2009 at the suggestion of Vladeta Jovovic