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%I #15 Nov 03 2021 06:03:47
%S 0,1,1,4,18,116,1060,13019,193425,3313522,63667788,1351700744,
%T 31390695708,791372281393,21523271532811,628166776833181,
%U 19582955637428422,649472761243051940,22833268501579122332,848230375982060558217
%N Number of simple chord diagrams with n chords, modulo all symmetries.
%H E. Krasko and A. Omelchenko, <a href="http://arxiv.org/abs/1601.05073">Enumeration of Chord Diagrams without Loops and Parallel Chords</a>, arXiv preprint arXiv:1601.05073 [math.CO], 2016.
%H E. Krasko and A. Omelchenko, <a href="https://doi.org/10.37236/6037">Enumeration of Chord Diagrams without Loops and Parallel Chords</a>, The Electronic Journal of Combinatorics, 24(3) (2017), #P3.43.
%Y Cf. A003436, A003437, A007474, A278990, A278991, A278992, A278993.
%K nonn
%O 1,4
%A _N. J. A. Sloane_, Dec 07 2016
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