A258496 - cp's OEIS frontend

A258496 Number of words of length 2n such that all letters of the nonary 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)
9	4862
10	629850
11	47432550
12	2728352253
13	133216751525
14	5829093450180
15	236006398327050
16	9025008152896320
17	330547676678287002
18	11710509049983422030
19	404211829411082901714
20	13667296618312167097605
21	454559414725395785663741
22	14918526141220986683667840

[4862, 629850, 47432550, 2728352253, 133216751525, 5829093450180, 236006398327050, 9025008152896320, 330547676678287002, 11710509049983422030, 404211829411082901714, 13667296618312167097605, 454559414725395785663741, 14918526141220986683667840]

cp's OEIS Frontend

A258496 Number of words of length 2n such that all letters of the nonary 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