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

8,2

Links

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

Formula

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

Crossrefs

Column k=8 of A293113.

Cf. A293746, A293747.

Sequence in context: A343462 A207009 A196986 * A218268 A223882 A267961

Adjacent sequences: A293886 A293887 A293888 * A293890 A293891 A293892

Keyword

nonn

Author

Alois P. Heinz, Oct 18 2017

Status

approved