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A324448 Number of labeled cyclic chord diagrams with n chords such that the minimal chord length equals four. 2
1, 10, 141, 2107, 35568, 661329, 13444940, 297333278, 7122103435, 183969320652, 5102519835609, 151340386825771, 4782068352314304, 160422533608810186, 5695524314835911655, 213389274860898491690, 8414796730663230017112, 348422910620718837979244 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 4..404

FORMULA

a(n) = A324430(n) - A324431(n).

CROSSREFS

Column k=4 of A324429.

Cf. A324430, A324431.

Sequence in context: A254834 A093470 A093471 * A277310 A277372 A181162

Adjacent sequences:  A324445 A324446 A324447 * A324449 A324450 A324451

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 28 2019

STATUS

approved

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Last modified December 7 03:00 EST 2019. Contains 329836 sequences. (Running on oeis4.)