Total number of levels in all Dyck paths of semilength n containing exactly 2 path nodes.

A371903

Total number of levels in all Dyck paths of semilength n containing exactly 2 path nodes.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =5a(4) =15a(5) =44a(6) =134a(7) =427a(8) =1408a(9) =4753a(10) =16321a(11) =56812a(12) =200046a(13) =711425a(14) =2551886a(15) =9222147a(16) =33544682a(17) =122712465a(18) =451169747a(19) =1666248405a(20) =6178586630a(21) =22994275870a(22) =85859249486a(23) =321562877934

External references