Triangle read by rows: T(n,k) is the number of length n left factors of Dyck paths having k UDUD's, where U=(1,1) and D=(1,-1).
A191791
Triangle read by rows: T(n,k) is the number of length n left factors of Dyck paths having k UDUD's, where U=(1,1) and D=(1,-1).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =1a(6) =8a(7) =2a(8) =15a(9) =4a(10) =1a(11) =25a(12) =8a(13) =2a(14) =46a(15) =19a(16) =4a(17) =1a(18) =79a(19) =36a(20) =9a(21) =2a(22) =147a(23) =76a(24) =24a(25) =4a(26) =1a(27) =256a(28) =146a(29) =48
External references
- oeis: A191791