A293920 Number of linear chord diagrams having n chords and minimal chord length seven.
1, 159, 7564, 245964, 6996588, 193799140, 5489211751, 162272284974, 5047554996855, 165595774518042, 5728636935767404, 208700950019470460, 7993330299623656154, 321268248361695869991, 13525506763517368392668, 595415097485805608016210, 27361311228606445955339071
Offset: 7
Keywords
Links
- Alois P. Heinz, Table of n, a(n) for n = 7..405
Crossrefs
Column k=7 of A293881.
Formula
a(n) ~ (exp(-6) - exp(-7)) * 2^(n + 1/2) * n^n / exp(n). - Vaclav Kotesovec, Oct 25 2017