Number of down-up parking functions of length n.
A264963
Number of down-up parking functions of length n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =17a(5) =104a(6) =915a(7) =8618a(8) =104436a(9) =1337282a(10) =20709209a(11) =336013996a(12) =6343919118a(13) =124736306407
External references
- oeis: A264963