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Number of connected chord diagrams of degree n.
1

%I #15 Feb 05 2019 14:01:39

%S 1,1,2,6,31,255,2788,37333,578799,10134071,197394232,4231417728,

%T 98991987830,2510081238264,68583045013542,2009094843480565,

%U 62824038815664719,2088829704241946181,73591470349452760456,2738742863175749456078

%N Number of 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.

%F a(n) = A007769(n) - A317184(n). - _Sean A. Irvine_, Feb 05 2019

%t Stoimenow states that a Mma package is available from his website. - _N. J. A. Sloane_, Jul 26 2018

%K nonn

%O 1,3

%A Alexander Stoimenow (stoimeno(AT)mail.informatik.hu-berlin.de)

%E More terms from _Sean A. Irvine_, Feb 05 2019