Number of distinct finite languages over 4-ary alphabet, whose minimum regular expression has ordinary length n.

A211954

Number of distinct finite languages over 4-ary alphabet, whose minimum regular expression has ordinary length n.

Terms

    a(0) =6a(1) =16a(2) =74a(3) =336a(4) =1474a(5) =6560a(6) =28861a(7) =128720a(8) =578033a(9) =2624460

External references