Number of sets of nonempty words with a total of n letters over nonary alphabet containing the ninth letter such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A293890
Number of sets of nonempty words with a total of n letters over nonary alphabet containing the ninth 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) =10a(2) =100a(3) =752a(4) =5541a(5) =36977a(6) =243498a(7) =1535725a(8) =9622087a(9) =59096165a(10) =362231798a(11) =2201156531a(12) =13388589925a(13) =81219563343a(14) =494086167465
External references
- oeis: A293890