Number of ascent sequences of length 2n with exactly n flat steps.
A242164
Number of ascent sequences of length 2n with exactly n flat steps.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =20a(4) =175a(5) =2016a(6) =28182a(7) =465036a(8) =8828820a(9) =189496450a(10) =4535113154a(11) =119706872376
External references
- oeis: A242164