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

Author

Alois P. Heinz, Oct 19 2017

Keywords

• nonn

Links

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

Crossrefs

Column k=6 of A293881.

Formula

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