Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k UDUDU's (n >= 0; 0 <= k <= n-2 for n >= 2).
A128753
Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k UDUDU's (n >= 0; 0 <= k <= n-2 for n >= 2).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =1a(5) =31a(6) =4a(7) =1a(8) =113a(9) =19a(10) =4a(11) =1a(12) =431a(13) =86a(14) =21a(15) =4a(16) =1a(17) =1697a(18) =393a(19) =101a(20) =23a(21) =4a(22) =1a(23) =6847a(24) =1800a(25) =492a(26) =116a(27) =25a(28) =4a(29) =1
External references
- oeis: A128753