Sum over all peaks of Dyck paths of semilength n of the arithmetic mean of the x and y coordinates.

A258431

Sum over all peaks of Dyck paths of semilength n of the arithmetic mean of the x and y coordinates.

Terms

    a(0) =0a(1) =1a(2) =5a(3) =23a(4) =102a(5) =443a(6) =1898a(7) =8054a(8) =33932a(9) =142163a(10) =592962a(11) =2464226a(12) =10209620a(13) =42190558a(14) =173962532a(15) =715908428a(16) =2941192472a(17) =12065310083a(18) =49428043442a(19) =202249741418a(20) =826671597572

External references