A class of rooted trees with n nodes.

A005373

A class of rooted trees with n nodes.

Terms

    a(0) =1a(1) =3a(2) =21a(3) =231a(4) =3495a(5) =67455a(6) =1584765a(7) =43897455a(8) =1400923755a(9) =50619052575

External references