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A293916
Number of linear chord diagrams having n chords and minimal chord length three.
2
1, 9, 79, 854, 11105, 167273, 2855096, 54426601, 1146050151, 26418261876, 661704149855, 17894827830455, 519672858520861, 16129429179859894, 532839970205194270, 18667063990244959414, 691265187531408182336, 26979801565685043088417, 1106929654165005908000185
OFFSET
3,2
LINKS
FORMULA
a(n) ~ (exp(-2) - exp(-3)) * 2^(n + 1/2) * n^n / exp(n). - Vaclav Kotesovec, Oct 25 2017
CROSSREFS
Column k=3 of A293881.
Sequence in context: A348895 A293723 A255807 * A293731 A254833 A342933
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 19 2017
STATUS
approved