A324431 Number of labeled cyclic chord diagrams with n chords such that every chord has length at least five.

1, 0, 0, 0, 0, 1, 18, 381, 7601, 160784, 3621067, 87089383, 2235081950, 61129825519, 1778536033055, 54930050817476, 1796853497380257, 62110926582550043, 2263534922105574576, 86779223311878261139, 3492564794206986891273, 147269976213917444452508

Offset

0,7

Links

Alois P. Heinz, Table of n, a(n) for n = 0..404

Crossrefs

Column k=5 of A324428.

Sequence in context: A099276 A221348 A285400 * A070943 A252888 A159647

Adjacent sequences: A324428 A324429 A324430 * A324432 A324433 A324434

Keyword

nonn

Author

Alois P. Heinz, Feb 27 2019

Status

approved