Unlabeled super-Catalan numbers: patterns of nonintersecting chords joining unlabeled points on a circle.

A183757

Unlabeled super-Catalan numbers: patterns of nonintersecting chords joining unlabeled points on a circle.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =74a(6) =324a(7) =1558a(8) =7640a(9) =38245

External references