A194720 - cp's OEIS frontend

A194720 Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting eight doublets into the initially empty word.

n	a(n)
0	0
1	1
2	6435
3	381333
4	5068915
5	33563481
6	148733571
7	507709165
8	1443039123
9	3581326065
10	8006545891
11	16475259141
12	31690921395
13	57644499913
14	100028603715
15	166732334301
16	268424064211
17	419229350625
18	637511191203
19	946759829365
20	1376599316211
21	1963918036281

[0, 1, 6435, 381333, 5068915, 33563481, 148733571, 507709165, 1443039123, 3581326065, 8006545891, 16475259141, 31690921395, 57644499913, 100028603715, 166732334301, 268424064211, 419229350625, 637511191203, 946759829365, 1376599316211, 1963918036281]

cp's OEIS Frontend

A194720 Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting eight doublets into the initially empty word.

Table of values

List of values