Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k peaks at even height.
A091869
Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k peaks at even height.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =1a(6) =4a(7) =6a(8) =3a(9) =1a(10) =9a(11) =16a(12) =12a(13) =4a(14) =1a(15) =21a(16) =45a(17) =40a(18) =20a(19) =5a(20) =1a(21) =51a(22) =126a(23) =135a(24) =80a(25) =30a(26) =6a(27) =1a(28) =127a(29) =357
External references
- oeis: A091869