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%I #5 Jun 13 2018 10:28:25
%S 1,1,2,6,21,110,789,8336,117283,2026331,40302425,892278076
%N Number of nonisomorphic connected circle graphs of order n
%H 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 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 L. E. Danielsen, <a href="http://www.ii.uib.no/~larsed/circle/">Database of Circle Graphs</a>.
%Y Cf. A156809.
%K hard,nonn
%O 1,3
%A Lars Eirik Danielsen (larsed(AT)ii.uib.no), Feb 16 2009
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