Irregular triangle read by rows: T(n,k) gives the number of ballot sequences of length n having k descents, n>=0, 0<=k<=A083920(n-1).
A238122
Irregular triangle read by rows: T(n,k) gives the number of ballot sequences of length n having k descents, n>=0, 0<=k<=A083920(n-1).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =1a(5) =5a(6) =5a(7) =7a(8) =16a(9) =3a(10) =11a(11) =43a(12) =21a(13) =1a(14) =15a(15) =99a(16) =101a(17) =17a(18) =22a(19) =215a(20) =373a(21) =145a(22) =9a(23) =30a(24) =430a(25) =1174a(26) =836a(27) =146a(28) =4a(29) =42
External references
- oeis: A238122