Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n having k DDU and LDU's.

A128727

Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n having k DDU and LDU's.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =1a(5) =27a(6) =9a(7) =81a(8) =54a(9) =2a(10) =243a(11) =270a(12) =30a(13) =729a(14) =1215a(15) =270a(16) =5a(17) =2187a(18) =5103a(19) =1890a(20) =105a(21) =6561a(22) =20412a(23) =11340a(24) =1260a(25) =14a(26) =19683a(27) =78732a(28) =61236a(29) =11340

External references