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

3,2

Links

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

Formula

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

Crossrefs

Column k=3 of A324429.

Cf. A306386, A324430.

Sequence in context: A365816 A207412 A362167 * A060435 A153851 A141372

Adjacent sequences: A324444 A324445 A324446 * A324448 A324449 A324450

Keyword

nonn

Author

Alois P. Heinz, Feb 28 2019

Status

approved