Number of multisets of nonempty words with a total of n letters over nonary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293739
Number of multisets of nonempty words with a total of n letters over nonary 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) =3a(3) =7a(4) =20a(5) =54a(6) =164a(7) =500a(8) =1630a(9) =5472a(10) =19256a(11) =70121a(12) =265723a(13) =1041184a(14) =4225484a(15) =17689505a(16) =76392933a(17) =339283021a(18) =1548592471a(19) =7246210567a(20) =34725853445a(21) =170096822940a(22) =850715642495
External references
- oeis: A293739