A293921 Number of linear chord diagrams having n chords and minimal chord length eight.

1, 319, 23012, 1007508, 35994000, 1189202172, 38767936708, 1287523504769, 44237669097482, 1583944615087121, 59277212496035478, 2320361242104891484, 94969568142679887216, 4060520653281063962444, 181153019365969689229302, 8422282201884215125698329

Offset: 8

Author

Alois P. Heinz, Oct 19 2017

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 8..300

Crossrefs

Column k=8 of A293881.

Formula

a(n) ~ (exp(-7) - exp(-8)) * 2^(n + 1/2) * n^n / exp(n). - Vaclav Kotesovec, Oct 25 2017