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A278994 Number of simple chord diagrams with n chords, modulo all symmetries. 0

%I

%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, 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, A. Omelchenko, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v24i3p43">Enumeration of Chord Diagrams without Loops and Parallel Chords</a>, The Electronic Journal of Combinatorics, 24(3) (2017), #P3.43.

%K nonn

%O 1,4

%A _N. J. A. Sloane_, Dec 07 2016

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Last modified September 19 22:06 EDT 2021. Contains 347576 sequences. (Running on oeis4.)