Triangle read by rows: T(n,k) is the number of Grand Dyck paths of semilength n that have k double rises (n >= 1, k >= 0).

A118963

Triangle read by rows: T(n,k) is the number of Grand Dyck paths of semilength n that have k double rises (n >= 1, k >= 0).

Terms

    a(0) =2a(1) =3a(2) =3a(3) =4a(4) =12a(5) =4a(6) =5a(7) =30a(8) =30a(9) =5a(10) =6a(11) =60a(12) =120a(13) =60a(14) =6a(15) =7a(16) =105a(17) =350a(18) =350a(19) =105a(20) =7a(21) =8a(22) =168a(23) =840a(24) =1400a(25) =840a(26) =168a(27) =8a(28) =9a(29) =252

External references