A258492 - cp's OEIS frontend

A258492 Number of words of length 2n such that all letters of the quinary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting doublets into the initially empty word.

n	a(n)
5	42
6	1485
7	34034
8	647920
9	11187462
10	182587701
11	2880017910
12	44477796451
13	677940669900
14	10250875770135
15	154278143783022
16	2316262521915440
17	34742240691197182
18	521131993897607925
19	7822497290908844702
20	117554364707534272375
21	1769075045150700563052

[42, 1485, 34034, 647920, 11187462, 182587701, 2880017910, 44477796451, 677940669900, 10250875770135, 154278143783022, 2316262521915440, 34742240691197182, 521131993897607925, 7822497290908844702, 117554364707534272375, 1769075045150700563052]

cp's OEIS Frontend

A258492 Number of words of length 2n such that all letters of the quinary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting doublets into the initially empty word.

Table of values

List of values