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A324446 Number of labeled cyclic chord diagrams with n chords such that the minimal chord length equals two. 2
1, 3, 24, 225, 2489, 32326, 483968, 8211543, 155740501, 3265307342, 74995101843, 1872508994356, 50500982610620, 1463062187672336, 45314261742435296, 1494164679669072424, 52257665502536426741, 1932255827699763531474, 75312621088768346098203 (list; graph; refs; listen; history; text; internal format)
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: A292311 A279973 A274737 * A307514 A225107 A249926

Adjacent sequences:  A324443 A324444 A324445 * A324447 A324448 A324449

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 28 2019

STATUS

approved

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Last modified October 22 12:27 EDT 2019. Contains 328318 sequences. (Running on oeis4.)