Triangle read by rows: T(n,k) is the number of length n left factors of Dyck paths having k DUU's, where U=(1,1) and D=(1,-1).

A191795

Triangle read by rows: T(n,k) is the number of length n left factors of Dyck paths having k DUU's, where U=(1,1) and D=(1,-1).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =1a(6) =7a(7) =3a(8) =11a(9) =9a(10) =15a(11) =19a(12) =1a(13) =23a(14) =42a(15) =5a(16) =31a(17) =77a(18) =18a(19) =47a(20) =150a(21) =54a(22) =1a(23) =63a(24) =255a(25) =137a(26) =7a(27) =95a(28) =464a(29) =333

External references