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 A034892 #8 Feb 20 2023 22:08:38 %S A034892 1,1,3,8,39,226,2283,36789,1062679,55717077,5405078682,972656526492, %T A034892 325183692812200,202373967993972497,235081289816026793049, %U A034892 511296223391186047847309,2088912833728676472658628201,16081914207958884651686215477871,234010862353438997655954463710225233 %N A034892 Number of balanced signed graphs on n unlabeled nodes. %D A034892 R. C. Read and R. J. Wilson, An Atlas of Graphs, Oxford, 1998. %H A034892 Andrew Howroyd, <a href="/A034892/b034892.txt">Table of n, a(n) for n = 0..50</a> %H A034892 Wikipedia, <a href="https://en.wikipedia.org/wiki/Signed_graph">Signed graph</a> %F A034892 Euler transform of A318590. %Y A034892 Cf. A004102, A005142, A318590. %K A034892 nonn,nice %O A034892 0,3 %A A034892 Ronald C. Read %E A034892 Name clarified and offset corrected by _Andrew Howroyd_, Sep 25 2018 %E A034892 a(0)=1 prepended and terms a(13) and beyond from _Andrew Howroyd_, Sep 25 2018