A258493 - cp's OEIS frontend

A258493 Number of words of length 2n such that all letters of the senary 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)
6	132
7	7007
8	231868
9	6191808
10	146698848
11	3229298919
12	67773956250
13	1377513928505
14	27389291758920
15	536341475466069
16	10391807506431956
17	199869644353809760
18	3824918464184384952
19	72954292150964887751
20	1388571904028052188458
21	26397789023379585277557

[132, 7007, 231868, 6191808, 146698848, 3229298919, 67773956250, 1377513928505, 27389291758920, 536341475466069, 10391807506431956, 199869644353809760, 3824918464184384952, 72954292150964887751, 1388571904028052188458, 26397789023379585277557]

cp's OEIS Frontend

A258493 Number of words of length 2n such that all letters of the senary 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