Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k UUDD's starting at level 0; here U=(1,1), D=(1,-1) (0<=k<=floor(n/2)).
A114486
Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k UUDD's starting at level 0; here U=(1,1), D=(1,-1) (0<=k<=floor(n/2)).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =2a(6) =10a(7) =3a(8) =1a(9) =31a(10) =8a(11) =3a(12) =98a(13) =27a(14) =6a(15) =1a(16) =321a(17) =88a(18) =16a(19) =4a(20) =1078a(21) =287a(22) =54a(23) =10a(24) =1a(25) =3686a(26) =960a(27) =183a(28) =28a(29) =5
External references
- oeis: A114486