Number of sets of nonempty words with a total of n letters over denary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293749
Number of sets of nonempty words with a total of n letters over denary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =15a(5) =45a(6) =136a(7) =430a(8) =1415a(9) =4845a(10) =17235a(11) =63508a(12) =242841a(13) =959746a(14) =3924747a(15) =16551199a(16) =71994097a(17) =322098625a(18) =1481655067a(19) =6990945197a(20) =33812067833a(21) =167294687170a(22) =846131720816
External references
- oeis: A293749