A208674 - cp's OEIS frontend

A208674 Number of words, either empty or beginning with the first letter of the n-ary alphabet, where each letter of the alphabet occurs 3 times and letters of neighboring word positions are equal or neighbors in the alphabet.

n	a(n)
0	1
1	1
2	10
3	37
4	163
5	640
6	2503
7	9559
8	36154
9	135541
10	505279
11	1875592
12	6941035
13	25629211
14	94478338
15	347857921
16	1279622611
17	4704064120
18	17284247263
19	63484653151
20	233114307274
21	855817783741
22	3141437229271
23	11529935743528
24	42314502514051
25	155283277278547

[1, 1, 10, 37, 163, 640, 2503, 9559, 36154, 135541, 505279, 1875592, 6941035, 25629211, 94478338, 347857921, 1279622611, 4704064120, 17284247263, 63484653151, 233114307274, 855817783741, 3141437229271, 11529935743528, 42314502514051, 155283277278547]

cp's OEIS Frontend

A208674 Number of words, either empty or beginning with the first letter of the n-ary alphabet, where each letter of the alphabet occurs 3 times and letters of neighboring word positions are equal or neighbors in the alphabet.

Table of values

List of values