A001285 - cp's OEIS frontend

A001285 Thue-Morse sequence: let A_k denote the first 2^k terms; then A_0 = 1 and for k >= 0, A_{k+1} = A_k B_k, where B_k is obtained from A_k by interchanging 1's and 2's.

n	a(n)
0	1
1	2
2	2
3	1
4	2
5	1
6	1
7	2
8	2
9	1
10	1
11	2
12	1
13	2
14	2
15	1
16	2
17	1
18	1
19	2
20	1
21	2
22	2
23	1
24	1
25	2
26	2
27	1
28	2
29	1
30	1
31	2
32	2
33	1
34	1
35	2
36	1
37	2
38	2
39	1
40	1
41	2
42	2
43	1
44	2
45	1
46	1
47	2
48	1
49	2
50	2
51	1
52	2
53	1
54	1
55	2
56	2
57	1
58	1
59	2
60	1
61	2
62	2
63	1
64	2
65	1
66	1
67	2
68	1
69	2
70	2
71	1
72	1
73	2
74	2
75	1
76	2
77	1
78	1
79	2
80	1
81	2
82	2
83	1
84	2
85	1
86	1
87	2
88	2
89	1
90	1
91	2
92	1
93	2
94	2
95	1
96	1
97	2
98	2
99	1
100	2
101	1

[1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 2, 1]

cp's OEIS Frontend

A001285 Thue-Morse sequence: let A_k denote the first 2^k terms; then A_0 = 1 and for k >= 0, A_{k+1} = A_k B_k, where B_k is obtained from A_k by interchanging 1's and 2's.

Table of values

List of values

n	a(n)
0	1
1	2
2	2
3	1
4	2
5	1
6	1
7	2
8	2
9	1
10	1
11	2
12	1
13	2
14	2
15	1
16	2
17	1
18	1
19	2
20	1
21	2
22	2
23	1
24	1
25	2
26	2
27	1
28	2
29	1
30	1
31	2
32	2
33	1
34	1
35	2
36	1
37	2
38	2
39	1
40	1
41	2
42	2
43	1
44	2
45	1
46	1
47	2
48	1
49	2
50	2
51	1
52	2
53	1
54	1
55	2
56	2
57	1
58	1
59	2
60	1
61	2
62	2
63	1
64	2
65	1
66	1
67	2
68	1
69	2
70	2
71	1
72	1
73	2
74	2
75	1
76	2
77	1
78	1
79	2
80	1
81	2
82	2
83	1
84	2
85	1
86	1
87	2
88	2
89	1
90	1
91	2
92	1
93	2
94	2
95	1
96	1
97	2
98	2
99	1
100	2
101	1

n	a(n)
0	1
1	2
2	2
3	1
4	2
5	1
6	1
7	2
8	2
9	1
10	1
11	2
12	1
13	2
14	2
15	1
16	2
17	1
18	1
19	2
20	1
21	2
22	2
23	1
24	1
25	2
26	2
27	1
28	2
29	1
30	1
31	2
32	2
33	1
34	1
35	2
36	1
37	2
38	2
39	1
40	1
41	2
42	2
43	1
44	2
45	1
46	1
47	2
48	1
49	2
50	2
51	1
52	2
53	1
54	1
55	2
56	2
57	1
58	1
59	2
60	1
61	2
62	2
63	1
64	2
65	1
66	1
67	2
68	1
69	2
70	2
71	1
72	1
73	2
74	2
75	1
76	2
77	1
78	1
79	2
80	1
81	2
82	2
83	1
84	2
85	1
86	1
87	2
88	2
89	1
90	1
91	2
92	1
93	2
94	2
95	1
96	1
97	2
98	2
99	1
100	2
101	1

n	a(n)
0	1
1	2
2	2
3	1
4	2
5	1
6	1
7	2
8	2
9	1
10	1
11	2
12	1
13	2
14	2
15	1
16	2
17	1
18	1
19	2
20	1
21	2
22	2
23	1
24	1
25	2
26	2
27	1
28	2
29	1
30	1
31	2
32	2
33	1
34	1
35	2
36	1
37	2
38	2
39	1
40	1
41	2
42	2
43	1
44	2
45	1
46	1
47	2
48	1
49	2
50	2
51	1
52	2
53	1
54	1
55	2
56	2
57	1
58	1
59	2
60	1
61	2
62	2
63	1
64	2
65	1
66	1
67	2
68	1
69	2
70	2
71	1
72	1
73	2
74	2
75	1
76	2
77	1
78	1
79	2
80	1
81	2
82	2
83	1
84	2
85	1
86	1
87	2
88	2
89	1
90	1
91	2
92	1
93	2
94	2
95	1
96	1
97	2
98	2
99	1
100	2
101	1