A293919 Number of linear chord diagrams having n chords and minimal chord length six.

1, 79, 2468, 59520, 1357636, 31817497, 788783482, 20863949689, 589285383470, 17736904863864, 567344416149454, 19230190154966409, 688795573160438196, 26004353625119063230, 1032308832642494976585, 42994854622890093855000, 1874878774341679655658359

Offset

6,2

Links

Alois P. Heinz, Table of n, a(n) for n = 6..405

Formula

a(n) ~ (exp(-5) - exp(-6)) * 2^(n + 1/2) * n^n / exp(n). - Vaclav Kotesovec, Oct 25 2017

Crossrefs

Column k=6 of A293881.

Sequence in context: A061997 A094731 A182347 * A205496 A017795 A017742

Adjacent sequences: A293916 A293917 A293918 * A293920 A293921 A293922

Keyword

nonn

Author

Alois P. Heinz, Oct 19 2017

Status

approved