Unlabeled super-Catalan numbers: patterns of nonintersecting chords joining unlabeled points on a flippable circle.
A183758
Unlabeled super-Catalan numbers: patterns of nonintersecting chords joining unlabeled points on a flippable circle.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =44a(6) =176a(7) =809a(8) =3883a(9) =19265
External references
- oeis: A183758