Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k LL's (n >= 0; 0 <= k <= n-2 for n >= 2).
A128724
Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k LL's (n >= 0; 0 <= k <= n-2 for n >= 2).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =1a(5) =30a(6) =5a(7) =1a(8) =107a(9) =23a(10) =6a(11) =1a(12) =399a(13) =105a(14) =31a(15) =7a(16) =1a(17) =1537a(18) =477a(19) =156a(20) =40a(21) =8a(22) =1a(23) =6069a(24) =2166a(25) =771a(26) =219a(27) =50a(28) =9a(29) =1
External references
- oeis: A128724