Sum of the heights of the second peaks in all Dyck paths of semilength n+2.
A112308
Sum of the heights of the second peaks in all Dyck paths of semilength n+2.
Terms
- a(0) =1a(1) =6a(2) =25a(3) =93a(4) =333a(5) =1180a(6) =4183a(7) =14895a(8) =53349a(9) =192239a(10) =696765a(11) =2539157a(12) =9299547a(13) =34215102a(14) =126411177a(15) =468822297a(16) =1744799967a(17) =6514363557a(18) =24393558687a(19) =91591471287a(20) =344764147407
External references
- oeis: A112308