Triangle read by rows: T(n,k) is number of Dyck paths of semilength n and having k UDUD's (here U=(1,1), D=(1,-1)).

A094507

Triangle read by rows: T(n,k) is number of Dyck paths of semilength n and having k UDUD's (here U=(1,1), D=(1,-1)).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =7a(8) =5a(9) =1a(10) =1a(11) =19a(12) =14a(13) =7a(14) =1a(15) =1a(16) =53a(17) =46a(18) =22a(19) =9a(20) =1a(21) =1a(22) =153a(23) =150a(24) =82a(25) =31a(26) =11a(27) =1a(28) =1a(29) =453

External references