A324447 Number of labeled cyclic chord diagrams with n chords such that the minimal chord length equals three.

1, 6, 57, 678, 9375, 146334, 2555228, 49498389, 1054882116, 24545326598, 619415271672, 16854164945997, 491956017936245, 15335174679459134, 508475723159116576, 17870522292434937714, 663618269365250877446, 25964529622925026990819, 1067602511902741954478695

Offset: 3

Author

Alois P. Heinz, Feb 28 2019

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 3..404

Crossrefs

Column k=3 of A324429.

Cf. A306386, A324430.

Formula

a(n) = A306386(n) - A324430(n).