A120908 - cp's OEIS frontend

A120908 Sum of the lengths of the drops in all ternary words of length n on {0,1,2}. The drops of a ternary word on {0,1,2} are the subwords 10,20 and 21, their lengths being the differences 1, 2 and 1, respectively.

n	a(n)
1	0
2	4
3	24
4	108
5	432
6	1620
7	5832
8	20412
9	69984
10	236196
11	787320
12	2598156
13	8503056
14	27634932
15	89282088
16	286978140
17	918330048
18	2927177028
19	9298091736
20	29443957164
21	92980917360
22	292889889684
23	920511081864
24	2887057484028

[0, 4, 24, 108, 432, 1620, 5832, 20412, 69984, 236196, 787320, 2598156, 8503056, 27634932, 89282088, 286978140, 918330048, 2927177028, 9298091736, 29443957164, 92980917360, 292889889684, 920511081864, 2887057484028]

cp's OEIS Frontend

A120908 Sum of the lengths of the drops in all ternary words of length n on {0,1,2}. The drops of a ternary word on {0,1,2} are the subwords 10,20 and 21, their lengths being the differences 1, 2 and 1, respectively.

Table of values

List of values