A290688 Number of linear chord diagrams having 2n chords and minimal chord length n.

1, 2, 26, 854, 52938, 5317342, 788783482, 162272284974, 44237669097482, 15439822086531614, 6715538352190953498, 3561963935537880874894, 2263250481436117389497386, 1697243825672918269588268286, 1483337827671250048404238399034, 1494549066141865576239455292770414

Offset

0,2

Links

Table of n, a(n) for n=0..15.

Formula

a(n) = A293881(2n,n).

Crossrefs

Cf. A293881.

Sequence in context: A354244 A059516 A210672 * A173103 A002704 A015215

Adjacent sequences: A290685 A290686 A290687 * A290689 A290690 A290691

Keyword

nonn

Author

Alois P. Heinz, Oct 18 2017

Status

approved