Number of multisets of nonempty words with a total of n letters over septenary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293737
Number of multisets of nonempty words with a total of n letters over septenary 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) =1629a(9) =5462a(10) =19164a(11) =69457a(12) =261154a(13) =1012164a(14) =4045640a(15) =16611121a(16) =70001515a(17) =301922104a(18) =1331128134a(19) =5986321599a(20) =27426419974a(21) =127801386949a(22) =605016657100
External references
- oeis: A293737