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.

1, 10, 100, 752, 5541, 36977, 243498, 1535725, 9622087, 59096165, 362231798, 2201156531, 13388589925, 81219563343, 494086167465, 3007727300865, 18380979656356, 112620528644918, 693158020152524, 4281848080792280, 26578705462004141, 165681105341062256

Offset

9,2

Links

Alois P. Heinz, Table of n, a(n) for n = 9..1000

Formula

a(n) = A293748(n) - A293747(n).

Crossrefs

Column k=9 of A293113.

Cf. A293747, A293748.

Sequence in context: A223920 A223865 A366669 * A218269 A224348 A213298

Adjacent sequences: A293887 A293888 A293889 * A293891 A293892 A293893

Keyword

nonn

Author

Alois P. Heinz, Oct 18 2017

Status

approved