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.

1, 9, 81, 554, 3723, 22795, 138112, 804518, 4666521, 26601027, 151607448, 858078020, 4867646261, 27569926921, 156731332711, 892188573587, 5101471557918, 29254697416411, 168575093334130, 975019430127356, 5667406033511452, 33079212453456235, 194029375272192986

Offset: 8

Author

Alois P. Heinz, Oct 18 2017

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 8..1000

Crossrefs

Column k=8 of A293113.

Cf. A293746, A293747.

Formula

a(n) = A293747(n) - A293746(n).