Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having abscissa of the first return to the x-axis equal to 2k (1 <= k <= n).
A129159
Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having abscissa of the first return to the x-axis equal to 2k (1 <= k <= n).
Terms
- a(0) =1a(1) =2a(2) =1a(3) =4a(4) =4a(5) =2a(6) =11a(7) =9a(8) =11a(9) =5a(10) =37a(11) =21a(12) =31a(13) =34a(14) =14a(15) =138a(16) =59a(17) =76a(18) =116a(19) =112a(20) =42a(21) =544a(22) =198a(23) =198a(24) =315a(25) =448a(26) =384a(27) =132a(28) =2220a(29) =743
External references
- oeis: A129159