A321040 - cp's OEIS frontend

A321040 Number of words of length 3n such that all letters of the denary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting triples of identical letters into the initially empty word.

n	a(n)
10	1430715
11	385671000
12	59757446980
13	7005490433656
14	691555233881785
15	60757817462444531
16	4909804407096952946
17	372791285261732999200
18	26986460830582840320825
19	1882051044395835159556710
20	127426007577261157375345878
21	8424538202077517861490125956

[1430715, 385671000, 59757446980, 7005490433656, 691555233881785, 60757817462444531, 4909804407096952946, 372791285261732999200, 26986460830582840320825, 1882051044395835159556710, 127426007577261157375345878, 8424538202077517861490125956]

cp's OEIS Frontend

A321040 Number of words of length 3n such that all letters of the denary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting triples of identical letters into the initially empty word.

Table of values

List of values