A324446 Number of labeled cyclic chord diagrams with n chords such that the minimal chord length equals two.

1, 3, 24, 225, 2489, 32326, 483968, 8211543, 155740501, 3265307342, 74995101843, 1872508994356, 50500982610620, 1463062187672336, 45314261742435296, 1494164679669072424, 52257665502536426741, 1932255827699763531474, 75312621088768346098203

Offset

2,2

Links

Alois P. Heinz, Table of n, a(n) for n = 2..404

Formula

a(n) = A003436(n) - A306386(n).

Crossrefs

Column k=2 of A324429.

Cf. A003436, A306386.

Sequence in context: A370986 A279973 A274737 * A307514 A225107 A249926

Adjacent sequences: A324443 A324444 A324445 * A324447 A324448 A324449

Keyword

nonn

Author

Alois P. Heinz, Feb 28 2019

Status

approved