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Number of "non-connected" chord diagrams of degree n.
1

%I #11 Feb 05 2019 01:43:07

%S 0,1,3,12,74,647,6961,89739,1337152,22609111,427604861,8945156182,

%T 205080060435,5113424483894,137759755603055,3987742282544259,

%U 123430664010624370,4067922952436728611,142218912116692593949

%N Number of "non-connected" chord diagrams of degree n.

%H Alexander Stoimenow, <a href="https://doi.org/10.1016/S0012-365X(99)00347-7">On the number of chord diagrams</a>, Discr. Math. 218 (2000), 209-233.

%t Stoimenow states that a Mma package is available from his website.

%Y Cf. A005034, A018225.

%K nonn

%O 1,3

%A _N. J. A. Sloane_, Jul 26 2018

%E More terms from _Sean A. Irvine_, Feb 04 2019