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 A334325 #7 Apr 24 2020 07:52:12 %S A334325 2,2,4,8,20,42,100,228,540,1278,3088,7436,18176,44436,109536,270726, %T A334325 672400,1674764,4185888,10488914,26352252,66354472,167429028, %U A334325 423270120,1071908028,2718939372,6906918040,17569856618,44751600732,114121225984,291346481204,744569863528 %N A334325 Number of irreducible, unrooted, unoriented self-avoiding chains of length n for the square lattice. %H A334325 Nathan Clisby, <a href="https://arxiv.org/abs/1302.2796">Endless self-avoiding walks</a>, arXiv:1302.2796 [cond-mat.stat-mech], 2013. See Table 2 column d_n p. 22. %Y A334325 Cf. A334322, A334323, A334324. %K A334325 nonn %O A334325 1,1 %A A334325 _Michel Marcus_, Apr 23 2020