Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k returns to the x-axis (1 <= k <= n).

A128741

Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k returns to the x-axis (1 <= k <= n).

Terms

    a(0) =1a(1) =2a(2) =1a(3) =6a(4) =3a(5) =1a(6) =20a(7) =11a(8) =4a(9) =1a(10) =72a(11) =42a(12) =17a(13) =5a(14) =1a(15) =274a(16) =166a(17) =72a(18) =24a(19) =6a(20) =1a(21) =1086a(22) =675a(23) =307a(24) =111a(25) =32a(26) =7a(27) =1a(28) =4438a(29) =2809

External references