Number of sets of nonempty words with a total of n letters over octonary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293747
Number of sets of nonempty words with a total of n letters over octonary 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) =4844a(10) =17224a(11) =63397a(12) =241968a(13) =953213a(14) =3879822a(15) =16250333a(16) =70050877a(17) =309714232a(18) =1404000641a(19) =6506809837a(20) =30813282963a(21) =148741986670a(22) =731495853897
External references
- oeis: A293747