A386969 - cp's OEIS frontend

A386969 A variant of Recamán's sequence (A005132): a(0) = 0; for n > 0, a(n) = a(n-1) - n if nonnegative and not already in the sequence, otherwise a(n) = a(n-1) + n + 3.

n	a(n)
0	0
1	4
2	2
3	8
4	15
5	10
6	19
7	12
8	23
9	14
10	27
11	16
12	31
13	18
14	35
15	20
16	39
17	22
18	43
19	24
20	47
21	26
22	51
23	28
24	55
25	30
26	59
27	32
28	63
29	34
30	67
31	36
32	71
33	38
34	75
35	40
36	79
37	42
38	83
39	44
40	87
41	46
42	91
43	48
44	95
45	50
46	99
47	52
48	103
49	54
50	107
51	56
52	111
53	58
54	115
55	60
56	119
57	62
58	123
59	64
60	127
61	66
62	131
63	68
64	135
65	70
66	139
67	72
68	143
69	74
70	147
71	76
72	151

[0, 4, 2, 8, 15, 10, 19, 12, 23, 14, 27, 16, 31, 18, 35, 20, 39, 22, 43, 24, 47, 26, 51, 28, 55, 30, 59, 32, 63, 34, 67, 36, 71, 38, 75, 40, 79, 42, 83, 44, 87, 46, 91, 48, 95, 50, 99, 52, 103, 54, 107, 56, 111, 58, 115, 60, 119, 62, 123, 64, 127, 66, 131, 68, 135, 70, 139, 72, 143, 74, 147, 76, 151]

cp's OEIS Frontend

A386969 A variant of Recamán's sequence (A005132): a(0) = 0; for n > 0, a(n) = a(n-1) - n if nonnegative and not already in the sequence, otherwise a(n) = a(n-1) + n + 3.

Table of values

List of values

n	a(n)
0	0
1	4
2	2
3	8
4	15
5	10
6	19
7	12
8	23
9	14
10	27
11	16
12	31
13	18
14	35
15	20
16	39
17	22
18	43
19	24
20	47
21	26
22	51
23	28
24	55
25	30
26	59
27	32
28	63
29	34
30	67
31	36
32	71
33	38
34	75
35	40
36	79
37	42
38	83
39	44
40	87
41	46
42	91
43	48
44	95
45	50
46	99
47	52
48	103
49	54
50	107
51	56
52	111
53	58
54	115
55	60
56	119
57	62
58	123
59	64
60	127
61	66
62	131
63	68
64	135
65	70
66	139
67	72
68	143
69	74
70	147
71	76
72	151

n	a(n)
0	0
1	4
2	2
3	8
4	15
5	10
6	19
7	12
8	23
9	14
10	27
11	16
12	31
13	18
14	35
15	20
16	39
17	22
18	43
19	24
20	47
21	26
22	51
23	28
24	55
25	30
26	59
27	32
28	63
29	34
30	67
31	36
32	71
33	38
34	75
35	40
36	79
37	42
38	83
39	44
40	87
41	46
42	91
43	48
44	95
45	50
46	99
47	52
48	103
49	54
50	107
51	56
52	111
53	58
54	115
55	60
56	119
57	62
58	123
59	64
60	127
61	66
62	131
63	68
64	135
65	70
66	139
67	72
68	143
69	74
70	147
71	76
72	151

n	a(n)
0	0
1	4
2	2
3	8
4	15
5	10
6	19
7	12
8	23
9	14
10	27
11	16
12	31
13	18
14	35
15	20
16	39
17	22
18	43
19	24
20	47
21	26
22	51
23	28
24	55
25	30
26	59
27	32
28	63
29	34
30	67
31	36
32	71
33	38
34	75
35	40
36	79
37	42
38	83
39	44
40	87
41	46
42	91
43	48
44	95
45	50
46	99
47	52
48	103
49	54
50	107
51	56
52	111
53	58
54	115
55	60
56	119
57	62
58	123
59	64
60	127
61	66
62	131
63	68
64	135
65	70
66	139
67	72
68	143
69	74
70	147
71	76
72	151