A321841 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A321841

Number of words w of length n such that each letter of the quinary alphabet is used at least once and for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z.

120, 360, 1470, 4872, 17649, 60465, 218360, 779649, 2878543, 10662640, 40402105, 154308568, 599106195, 2346709225, 9308176915, 37232621263, 150428771629, 612404221280, 2513790671891, 10388482748377, 43231607141305, 180987402799559, 762252080995334

(list; graph; refs; listen; history; text; internal format)

OFFSET

5,1

LINKS

Table of n, a(n) for n=5..27.

CROSSREFS

Column k=5 of A257783.

Sequence in context: A242845 A234915 A061218 * A052778 A354625 A354624

Adjacent sequences: A321838 A321839 A321840 * A321842 A321843 A321844

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 19 2018

STATUS

approved