Catalan trisection: A000108(3*n + 2)/2, n>=0.

A187359

Catalan trisection: A000108(3*n + 2)/2, n>=0.

Terms

    a(0) =1a(1) =21a(2) =715a(3) =29393a(4) =1337220a(5) =64822395a(6) =3282060210a(7) =171529806825

External references