Number of sets of nonempty words with a total of n letters over n-ary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293114
Number of sets of nonempty words with a total of n letters over n-ary 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) =63509a(12) =242854a(13) =959904a(14) =3926209a(15) =16564083a(16) =72097127a(17) =322898943a(18) =1487602607a(19) =7034420691a(20) =34122991199a(21) =169499127425a(22) =861596397518
External references
- oeis: A293114