Number of distinct regular languages over 4-ary alphabet, whose minimum regular expression has reverse Polish length n.
A211945
Number of distinct regular languages over 4-ary alphabet, whose minimum regular expression has reverse Polish length n.
Terms
- a(0) =6a(1) =4a(2) =26a(3) =62a(4) =244a(5) =920a(6) =3133a(7) =13529a(8) =48388a(9) =208634
External references
- oeis: A211945