Number of ascent sequences of length 2n with exactly n descents.
A241871
Number of ascent sequences of length 2n with exactly n descents.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =26a(5) =937a(6) =45747a(7) =2945144a(8) =242899690a(9) =25034354941
External references
- oeis: A241871