Catalan trisection: A000108(3*n), n >= 0.

A187357

Catalan trisection: A000108(3*n), n >= 0.

Terms

    a(0) =1a(1) =5a(2) =132a(3) =4862a(4) =208012a(5) =9694845a(6) =477638700a(7) =24466267020

External references