A293887 Number of sets of nonempty words with a total of n letters over senary alphabet containing the sixth 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, 7, 49, 268, 1448, 7228, 35878, 172470, 828380, 3924415, 18627313, 87940196, 416581962, 1971018227, 9364427840, 44535275966, 212749669917, 1018545160923, 4898593478484, 23625691956720, 114460931725922, 556278543737430, 2715406810871312, 13298453769286699

Offset

6,2

Links

Alois P. Heinz, Table of n, a(n) for n = 6..1000

Formula

a(n) = A293745(n) - A293744(n).

Crossrefs

Column k=6 of A293113.

Cf. A293744, A293745.

Sequence in context: A228459 A203059 A203383 * A224131 A218266 A213295

Adjacent sequences: A293884 A293885 A293886 * A293888 A293889 A293890

Keyword

nonn

Author

Alois P. Heinz, Oct 18 2017

Status

approved