A258497 - cp's OEIS frontend

A258497 Number of words of length 2n 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 doublets into the initially empty word.

n	a(n)
10	16796
11	2735810
12	255290156
13	17977098425
14	1063758951255
15	55927419074670
16	2700837720153300
17	122411464503168984
18	5284666028132079380
19	219622926821644989478
20	8855064908059488718600
21	348436223706779520860457
22	13441577595226619289460295
23	510180504585665885463323546

[16796, 2735810, 255290156, 17977098425, 1063758951255, 55927419074670, 2700837720153300, 122411464503168984, 5284666028132079380, 219622926821644989478, 8855064908059488718600, 348436223706779520860457, 13441577595226619289460295, 510180504585665885463323546]

cp's OEIS Frontend

A258497 Number of words of length 2n 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 doublets into the initially empty word.

Table of values

List of values