Triangle read by rows: T(n,k) is the number of ascent sequences of length n with last occurrence of the maximal value at position k-1.
A218581
Triangle read by rows: T(n,k) is the number of ascent sequences of length n with last occurrence of the maximal value at position k-1.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =0a(4) =1a(5) =4a(6) =0a(7) =1a(8) =4a(9) =10a(10) =0a(11) =1a(12) =6a(13) =15a(14) =31a(15) =0a(16) =1a(17) =10a(18) =29a(19) =62a(20) =115a(21) =0a(22) =1a(23) =18a(24) =63a(25) =148a(26) =288a(27) =496a(28) =0a(29) =1
External references
- oeis: A218581