A324448 Number of labeled cyclic chord diagrams with n chords such that the minimal chord length equals four.

1, 10, 141, 2107, 35568, 661329, 13444940, 297333278, 7122103435, 183969320652, 5102519835609, 151340386825771, 4782068352314304, 160422533608810186, 5695524314835911655, 213389274860898491690, 8414796730663230017112, 348422910620718837979244

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 A343689 A277372

Adjacent sequences: A324445 A324446 A324447 * A324449 A324450 A324451

Keyword

nonn

Author

Alois P. Heinz, Feb 28 2019

Status

approved