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A324447 Number of labeled cyclic chord diagrams with n chords such that the minimal chord length equals three. 2
1, 6, 57, 678, 9375, 146334, 2555228, 49498389, 1054882116, 24545326598, 619415271672, 16854164945997, 491956017936245, 15335174679459134, 508475723159116576, 17870522292434937714, 663618269365250877446, 25964529622925026990819, 1067602511902741954478695 (list; graph; refs; listen; history; text; internal format)
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: A130565 A124556 A207412 * A060435 A153851 A141372

Adjacent sequences:  A324444 A324445 A324446 * A324448 A324449 A324450

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 28 2019

STATUS

approved

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Last modified December 7 20:40 EST 2021. Contains 349589 sequences. (Running on oeis4.)