A132666 - cp's OEIS frontend

A132666 a(1)=1, a(n) = 2*a(n-1) if the minimal positive integer not yet in the sequence is greater than a(n-1), else a(n) = a(n-1)-1.

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

[1, 2, 4, 3, 6, 5, 10, 9, 8, 7, 14, 13, 12, 11, 22, 21, 20, 19, 18, 17, 16, 15, 30, 29, 28, 27, 26, 25, 24, 23, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 94, 93, 92, 91, 90, 89, 88, 87, 86, 85]

cp's OEIS Frontend

A132666 a(1)=1, a(n) = 2*a(n-1) if the minimal positive integer not yet in the sequence is greater than a(n-1), else a(n) = a(n-1)-1.

Table of values

List of values

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

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

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