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A293799 Number of multisets of nonempty words with a total of n letters over quaternary alphabet containing the fourth 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, 5, 26, 107, 439, 1663, 6283, 22912, 83507, 298936, 1071564, 3804461, 13542785, 47964338, 170456957, 604293910, 2150604057, 7647190962, 27302834888, 97491596984, 349544018586, 1254140950775, 4517792721381, 16291580640312, 58974333255158, 213744923737227 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 4..1000

FORMULA

a(n) = A293734(n) - A293733(n).

CROSSREFS

Column k=4 of A293109.

Cf. A293733, A293734.

Sequence in context: A047669 A297689 A002316 * A211606 A005499 A185552

Adjacent sequences:  A293796 A293797 A293798 * A293800 A293801 A293802

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Oct 16 2017

STATUS

approved

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Last modified May 17 12:55 EDT 2021. Contains 343971 sequences. (Running on oeis4.)