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%I #15 May 16 2018 08:28:29
%S 0,0,0,1,26,348,4466,61726,949795,16331482,312298796,6587217199,
%T 152030203190,3811719561156,103171205826822,2998417379370294,
%U 93127344062857976,3078376281077418971,107905190923235526392
%N Number of chiral chord diagrams on n nodes.
%H V. A. Liskovets, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL3/LISK/Derseq.html">Some easily derivable sequences</a>, J. Integer Sequences, 3 (2000), #00.2.2.
%F a(n) = A054499(n)-A018191(n). [Liskovets, referring to offset 1 in A054499]. - _R. J. Mathar_, Oct 01 2011
%K nonn,easy
%O 1,5
%A _N. J. A. Sloane_, May 24 2000
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