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

A211953

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

Terms

    a(0) =6a(1) =20a(2) =102a(3) =520a(4) =2628a(5) =13482a(6) =68747a(7) =354500a(8) =1840433

External references