Number of Dyck paths of semilength n having the property that the heights of the first and the last peaks do not disagree.

A193215

Number of Dyck paths of semilength n having the property that the heights of the first and the last peaks do not disagree.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =14a(6) =38a(7) =113a(8) =356a(9) =1164a(10) =3906a(11) =13364a(12) =46426a(13) =163294a(14) =580316a(15) =2080475a(16) =7515038a(17) =27324014a(18) =99920756a(19) =367264130a(20) =1356043388a(21) =5027345564a(22) =18706888196a(23) =69841532210a(24) =261545298848a(25) =982175296016

External references