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 A224978 #15 Mar 19 2023 09:36:27 %S A224978 1,1,2,5,14,49,227,1354 %N A224978 The number of completed primitive graphs of n loops, in enumerating Feynman graphs in quantum field theory. %C A224978 Table 2, page 10 of Brown and Schnetz. %H A224978 Francis Brown and Oliver Schnetz, <a href="http://arxiv.org/abs/1304.5342">Modular forms in quantum field theory</a>, arXiv:1304.5342 [math.AG], Apr 19, 2013. %H A224978 F. Brown, <a href="http://arxiv.org/abs/0910.0114v2">On the periods of some Feynman integrals</a>, arXiv:0910.0114v2 [math.AG], July 20, 2009. %H A224978 F. Brown, D. Doryn, <a href="http://arxiv.org/abs/1301.3056v1">Framings for graph hypersurfaces</a>, arXiv:1301.3056v1 [math.AG], Jan 14, 2013. %H A224978 O. Schnetz, <a href="https://arxiv.org/abs/0801.2856">Quantum periods: a census of phi^4 transcendentals</a>, arXiv:0801.2856 (2009), Table 1. %Y A224978 Cf. A005411, A115974, A214298. %K A224978 nonn %O A224978 3,3 %A A224978 _Jonathan Vos Post_, Apr 21 2013