4th-order Vatalan numbers (generalization of Catalan numbers).

A025757

4th-order Vatalan numbers (generalization of Catalan numbers).

Terms

    a(0) =1a(1) =1a(2) =7a(3) =69a(4) =783a(5) =9597a(6) =123495a(7) =1643397a(8) =22413183a(9) =311466829a(10) =4392857431a(11) =62702224213a(12) =903886452975

External references