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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. 2
1, 8, 64, 394, 2390, 13297, 73408, 391136, 2079440, 10889818, 57092581, 297655901, 1556501986, 8132631687, 42662224461, 224171916523, 1183189769473, 6263511343367, 33311244068612, 177803544643092, 953453596829798, 5132942333604244, 27758886429083153 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 7..1000

FORMULA

a(n) = A293746(n) - A293745(n).

CROSSREFS

Column k=7 of A293113.

Cf. A293745, A293746.

Sequence in context: A203437 A224132 A297376 * A218267 A189105 A181214

Adjacent sequences:  A293885 A293886 A293887 * A293889 A293890 A293891

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Oct 18 2017

STATUS

approved

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Last modified May 28 18:24 EDT 2022. Contains 354122 sequences. (Running on oeis4.)