Number of multisets of nonempty words with a total of n letters over quaternary alphabet such that within each word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A292719
Number of multisets of nonempty words with a total of n letters over quaternary alphabet such that within each word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =14a(4) =67a(5) =223a(6) =951a(7) =3680a(8) =16239a(9) =61656a(10) =260490a(11) =1035820a(12) =4451494a(13) =17534372a(14) =73518595a(15) =295928531a(16) =1253898892a(17) =5015867442a(18) =20920480946a(19) =84742519783a(20) =355861723649
External references
- oeis: A292719