Number of up-down parking functions of length n.
A260694
Number of up-down parking functions of length n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =17a(5) =120a(6) =915a(7) =9470a(8) =104436a(9) =1432713a(10) =20709209a(11) =354493902a(12) =6343919118a(13) =130255212146
External references
- oeis: A260694