A122497 - cp's OEIS frontend

A122497 Let f(S) denote the interchange of 1's and 2's in S. Let S_0 = 1, S_{N+1} = f(S_N).S_N, where the dot indicates concatenation. Sequence gives S_0.S_1.S_2.S_3....

n	a(n)
1	1
2	2
3	1
4	1
5	2
6	2
7	1
8	2
9	1
10	1
11	2
12	1
13	2
14	2
15	1
16	1
17	2
18	2
19	1
20	2
21	1
22	1
23	2
24	2
25	1
26	1
27	2
28	1
29	2
30	2
31	1
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	1
65	2
66	2
67	1
68	2
69	1
70	1
71	2
72	2
73	1
74	1
75	2
76	1
77	2
78	2
79	1
80	2
81	1
82	1
83	2
84	1
85	2
86	2
87	1
88	1
89	2
90	2
91	1
92	2
93	1
94	1
95	2
96	2
97	1
98	1
99	2
100	1
101	2
102	2
103	1
104	1
105	2

[1, 2, 1, 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, 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, 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]

cp's OEIS Frontend

A122497 Let f(S) denote the interchange of 1's and 2's in S. Let S_0 = 1, S_{N+1} = f(S_N).S_N, where the dot indicates concatenation. Sequence gives S_0.S_1.S_2.S_3....

Table of values

List of values

n	a(n)
1	1
2	2
3	1
4	1
5	2
6	2
7	1
8	2
9	1
10	1
11	2
12	1
13	2
14	2
15	1
16	1
17	2
18	2
19	1
20	2
21	1
22	1
23	2
24	2
25	1
26	1
27	2
28	1
29	2
30	2
31	1
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	1
65	2
66	2
67	1
68	2
69	1
70	1
71	2
72	2
73	1
74	1
75	2
76	1
77	2
78	2
79	1
80	2
81	1
82	1
83	2
84	1
85	2
86	2
87	1
88	1
89	2
90	2
91	1
92	2
93	1
94	1
95	2
96	2
97	1
98	1
99	2
100	1
101	2
102	2
103	1
104	1
105	2

n	a(n)
1	1
2	2
3	1
4	1
5	2
6	2
7	1
8	2
9	1
10	1
11	2
12	1
13	2
14	2
15	1
16	1
17	2
18	2
19	1
20	2
21	1
22	1
23	2
24	2
25	1
26	1
27	2
28	1
29	2
30	2
31	1
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	1
65	2
66	2
67	1
68	2
69	1
70	1
71	2
72	2
73	1
74	1
75	2
76	1
77	2
78	2
79	1
80	2
81	1
82	1
83	2
84	1
85	2
86	2
87	1
88	1
89	2
90	2
91	1
92	2
93	1
94	1
95	2
96	2
97	1
98	1
99	2
100	1
101	2
102	2
103	1
104	1
105	2

n	a(n)
1	1
2	2
3	1
4	1
5	2
6	2
7	1
8	2
9	1
10	1
11	2
12	1
13	2
14	2
15	1
16	1
17	2
18	2
19	1
20	2
21	1
22	1
23	2
24	2
25	1
26	1
27	2
28	1
29	2
30	2
31	1
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	1
65	2
66	2
67	1
68	2
69	1
70	1
71	2
72	2
73	1
74	1
75	2
76	1
77	2
78	2
79	1
80	2
81	1
82	1
83	2
84	1
85	2
86	2
87	1
88	1
89	2
90	2
91	1
92	2
93	1
94	1
95	2
96	2
97	1
98	1
99	2
100	1
101	2
102	2
103	1
104	1
105	2