Number of sets of nonempty words with a total of n letters over octonary alphabet containing the eighth letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293889
Number of sets of nonempty words with a total of n letters over octonary alphabet containing the eighth letter 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) =9a(2) =81a(3) =554a(4) =3723a(5) =22795a(6) =138112a(7) =804518a(8) =4666521a(9) =26601027a(10) =151607448a(11) =858078020a(12) =4867646261a(13) =27569926921a(14) =156731332711a(15) =892188573587
External references
- oeis: A293889