Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k UU's (doublerises) (n >= 1; 0 <= k <= n-1).
A128718
Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k UU's (doublerises) (n >= 1; 0 <= k <= n-1).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =5a(5) =4a(6) =1a(7) =9a(8) =18a(9) =8a(10) =1a(11) =14a(12) =50a(13) =56a(14) =16a(15) =1a(16) =20a(17) =110a(18) =220a(19) =160a(20) =32a(21) =1a(22) =27a(23) =210a(24) =645a(25) =840a(26) =432a(27) =64a(28) =1a(29) =35
External references
- oeis: A128718