Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n, having k ddu's [here u = (1,1) and d = (1,-1)].
A091894
Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n, having k ddu's [here u = (1,1) and d = (1,-1)].
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =1a(5) =8a(6) =6a(7) =16a(8) =24a(9) =2a(10) =32a(11) =80a(12) =20a(13) =64a(14) =240a(15) =120a(16) =5a(17) =128a(18) =672a(19) =560a(20) =70a(21) =256a(22) =1792a(23) =2240a(24) =560a(25) =14a(26) =512a(27) =4608a(28) =8064a(29) =3360
External references
- oeis: A091894