A277667 - cp's OEIS frontend

A277667 Number of n-length words over a quaternary alphabet {a_1,a_2,...,a_4} avoiding consecutive letters a_i, a_{i+1}.

n	a(n)
0	1
1	4
2	13
3	42
4	136
5	440
6	1423
7	4602
8	14883
9	48132
10	155660
11	503408
12	1628033
13	5265096
14	17027441
15	55067134
16	178088372
17	575941872
18	1862609199
19	6023720790
20	19480850935
21	63001517896
22	203748351160
23	658926832032
24	2130984459505
25	6891652526348
26	22287762039781

[1, 4, 13, 42, 136, 440, 1423, 4602, 14883, 48132, 155660, 503408, 1628033, 5265096, 17027441, 55067134, 178088372, 575941872, 1862609199, 6023720790, 19480850935, 63001517896, 203748351160, 658926832032, 2130984459505, 6891652526348, 22287762039781]

cp's OEIS Frontend

A277667 Number of n-length words over a quaternary alphabet {a_1,a_2,...,a_4} avoiding consecutive letters a_i, a_{i+1}.

Table of values

List of values