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 A156808 #7 Jul 22 2025 06:21:23 %S A156808 1,1,2,6,21,110,789,8336,117283,2026331,40302425,892278076 %N A156808 Number of nonisomorphic connected circle graphs of order n. %H A156808 R. Arratia, B. Bollobas, D. Coppersmith, and G. B. Sorkin, <a href="https://doi.org/10.1016/S0166-218X(00)00190-6">Euler circuits and DNA sequencing by hybridization</a>, Discrete Appl. Math., 104 (2000), 63-96. %H A156808 L. E. Danielsen and M. G. Parker, <a href="http://arxiv.org/abs/0804.2576">Interlace polynomials: Enumeration, unimodality, and connections to codes</a>, arXiv:0804.2576 [math.CO], 2008-2009. %H A156808 L. E. Danielsen, <a href="http://www.ii.uib.no/~larsed/circle/">Database of Circle Graphs</a>. %Y A156808 Cf. A156809. %K A156808 hard,nonn %O A156808 1,3 %A A156808 Lars Eirik Danielsen (larsed(AT)ii.uib.no), Feb 16 2009