A351330 - cp's OEIS frontend

A351330 A fractal-like sequence: erase all triples of contiguous terms that have an odd sum; the remaining terms rebuild the starting sequence.

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

[1, 2, 4, 6, 8, 3, 1, 2, 5, 7, 9, 4, 11, 13, 15, 6, 17, 19, 21, 8, 3, 1, 2, 5, 7, 10, 23, 12, 9, 25, 14, 16, 4, 18, 20, 27, 11, 22, 29, 24, 13, 15, 6, 17, 19, 26, 31, 28, 21, 33, 30, 32, 8, 34, 36, 35, 3, 38, 37, 40, 1, 39, 42, 44, 2, 46, 48, 41, 5, 50, 43, 52, 7, 45, 54, 56, 10, 58, 60, 47, 23, 12, 9, 25, 14]

cp's OEIS Frontend

A351330 A fractal-like sequence: erase all triples of contiguous terms that have an odd sum; the remaining terms rebuild the starting sequence.

Table of values

List of values

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

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

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