%I #7 Apr 24 2020 07:52:12
%S 2,2,4,8,20,42,100,228,540,1278,3088,7436,18176,44436,109536,270726,
%T 672400,1674764,4185888,10488914,26352252,66354472,167429028,
%U 423270120,1071908028,2718939372,6906918040,17569856618,44751600732,114121225984,291346481204,744569863528
%N Number of irreducible, unrooted, unoriented self-avoiding chains of length n for the square lattice.
%H 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 Cf. A334322, A334323, A334324.
%K nonn
%O 1,1
%A _Michel Marcus_, Apr 23 2020