Number of sets of nonempty words with a total of n letters over septenary alphabet containing the seventh letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293888
Number of sets of nonempty words with a total of n letters over septenary alphabet containing the seventh 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) =8a(2) =64a(3) =394a(4) =2390a(5) =13297a(6) =73408a(7) =391136a(8) =2079440a(9) =10889818a(10) =57092581a(11) =297655901a(12) =1556501986a(13) =8132631687a(14) =42662224461a(15) =224171916523
External references
- oeis: A293888