A290885 - cp's OEIS frontend

A290885 Let S be the sequence generated by these rules: 0 is in S, and if z is in S, then z * (1+i) and (z-1) * (1+i) + 1 are in S (where i denotes the imaginary unit), and duplicates are deleted as they occur; a(n) = the imaginary part of the n-th term of S.

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

[0, -1, -1, -2, 0, -1, -1, -2, 2, 1, 1, 0, 2, 1, 1, 0, 4, 3, 3, 2, 4, 3, 3, 2, 6, 5, 5, 4, 6, 5, 5, 4, 4, 3, 3, 2, 4, 3, 3, 2, 6, 5, 5, 4, 6, 5, 5, 4, 8, 7, 7, 6, 8, 7, 7, 6, 10, 9, 9, 8, 10, 9, 9, 8, 0, -1, -1, -2, 0, -1, -1, -2, 2, 1, 1, 0, 2, 1, 1, 0, 4, 3]

cp's OEIS Frontend

A290885 Let S be the sequence generated by these rules: 0 is in S, and if z is in S, then z * (1+i) and (z-1) * (1+i) + 1 are in S (where i denotes the imaginary unit), and duplicates are deleted as they occur; a(n) = the imaginary part of the n-th term of S.

Table of values

List of values

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

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

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