A109671 - cp's OEIS frontend

A109671 a(1)=1; thereafter, a(2n)=a(n), a(2n+1) is the smallest positive number such that |a(2n+1)-a(2n-1)|=a(n).

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	2
7	3
8	1
9	2
10	1
11	1
12	2
13	3
14	3
15	6
16	1
17	5
18	2
19	3
20	1
21	2
22	1
23	1
24	2
25	3
26	3
27	6
28	3
29	3
30	6
31	9
32	1
33	8
34	5
35	3
36	2
37	1
38	3
39	4
40	1
41	3
42	2
43	1
44	1
45	2
46	1
47	1
48	2
49	3
50	3
51	6
52	3
53	3
54	6
55	9
56	3
57	6
58	3
59	3
60	6
61	9
62	9
63	18
64	1
65	17
66	8
67	9
68	5
69	4
70	3
71	1
72	2
73	3
74	1
75	2
76	3
77	5
78	4
79	1
80	1
81	2
82	3
83	5
84	2
85	3
86	1
87	2
88	1
89	1
90	2
91	3
92	1
93	2
94	1
95	1
96	2
97	3
98	3
99	6
100	3
101	3
102	6
103	9
104	3

[1, 1, 2, 1, 1, 2, 3, 1, 2, 1, 1, 2, 3, 3, 6, 1, 5, 2, 3, 1, 2, 1, 1, 2, 3, 3, 6, 3, 3, 6, 9, 1, 8, 5, 3, 2, 1, 3, 4, 1, 3, 2, 1, 1, 2, 1, 1, 2, 3, 3, 6, 3, 3, 6, 9, 3, 6, 3, 3, 6, 9, 9, 18, 1, 17, 8, 9, 5, 4, 3, 1, 2, 3, 1, 2, 3, 5, 4, 1, 1, 2, 3, 5, 2, 3, 1, 2, 1, 1, 2, 3, 1, 2, 1, 1, 2, 3, 3, 6, 3, 3, 6, 9, 3]

cp's OEIS Frontend

A109671 a(1)=1; thereafter, a(2n)=a(n), a(2n+1) is the smallest positive number such that |a(2n+1)-a(2n-1)|=a(n).

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	2
7	3
8	1
9	2
10	1
11	1
12	2
13	3
14	3
15	6
16	1
17	5
18	2
19	3
20	1
21	2
22	1
23	1
24	2
25	3
26	3
27	6
28	3
29	3
30	6
31	9
32	1
33	8
34	5
35	3
36	2
37	1
38	3
39	4
40	1
41	3
42	2
43	1
44	1
45	2
46	1
47	1
48	2
49	3
50	3
51	6
52	3
53	3
54	6
55	9
56	3
57	6
58	3
59	3
60	6
61	9
62	9
63	18
64	1
65	17
66	8
67	9
68	5
69	4
70	3
71	1
72	2
73	3
74	1
75	2
76	3
77	5
78	4
79	1
80	1
81	2
82	3
83	5
84	2
85	3
86	1
87	2
88	1
89	1
90	2
91	3
92	1
93	2
94	1
95	1
96	2
97	3
98	3
99	6
100	3
101	3
102	6
103	9
104	3

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	2
7	3
8	1
9	2
10	1
11	1
12	2
13	3
14	3
15	6
16	1
17	5
18	2
19	3
20	1
21	2
22	1
23	1
24	2
25	3
26	3
27	6
28	3
29	3
30	6
31	9
32	1
33	8
34	5
35	3
36	2
37	1
38	3
39	4
40	1
41	3
42	2
43	1
44	1
45	2
46	1
47	1
48	2
49	3
50	3
51	6
52	3
53	3
54	6
55	9
56	3
57	6
58	3
59	3
60	6
61	9
62	9
63	18
64	1
65	17
66	8
67	9
68	5
69	4
70	3
71	1
72	2
73	3
74	1
75	2
76	3
77	5
78	4
79	1
80	1
81	2
82	3
83	5
84	2
85	3
86	1
87	2
88	1
89	1
90	2
91	3
92	1
93	2
94	1
95	1
96	2
97	3
98	3
99	6
100	3
101	3
102	6
103	9
104	3

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	2
7	3
8	1
9	2
10	1
11	1
12	2
13	3
14	3
15	6
16	1
17	5
18	2
19	3
20	1
21	2
22	1
23	1
24	2
25	3
26	3
27	6
28	3
29	3
30	6
31	9
32	1
33	8
34	5
35	3
36	2
37	1
38	3
39	4
40	1
41	3
42	2
43	1
44	1
45	2
46	1
47	1
48	2
49	3
50	3
51	6
52	3
53	3
54	6
55	9
56	3
57	6
58	3
59	3
60	6
61	9
62	9
63	18
64	1
65	17
66	8
67	9
68	5
69	4
70	3
71	1
72	2
73	3
74	1
75	2
76	3
77	5
78	4
79	1
80	1
81	2
82	3
83	5
84	2
85	3
86	1
87	2
88	1
89	1
90	2
91	3
92	1
93	2
94	1
95	1
96	2
97	3
98	3
99	6
100	3
101	3
102	6
103	9
104	3