A123483 - cp's OEIS frontend

A123483 Second order Recamán's sequence: a(0) = 0; for n > 0, a(n) = a(n-1) - A005132(n) if that number is positive and not already in the sequence, otherwise a(n-1) + A005132(n).

n	a(n)
0	0
1	1
2	4
3	10
4	8
5	15
6	2
7	22
8	34
9	13
10	24
11	46
12	36
13	59
14	50
15	26
16	18
17	43
18	86
19	148
20	106
21	169
22	128
23	110
24	68
25	51
26	94
27	78
28	122
29	107
30	62
31	48
32	94
33	173
34	60
35	138
36	252
37	175
38	136
39	58
40	20
41	99
42	136
43	56
44	92
45	11
46	46
47	128
48	162
49	79
50	112
51	28
52	60
53	145
54	114
55	200
56	170
57	83
58	54
59	142
60	170
61	81
62	108
63	198

[0, 1, 4, 10, 8, 15, 2, 22, 34, 13, 24, 46, 36, 59, 50, 26, 18, 43, 86, 148, 106, 169, 128, 110, 68, 51, 94, 78, 122, 107, 62, 48, 94, 173, 60, 138, 252, 175, 136, 58, 20, 99, 136, 56, 92, 11, 46, 128, 162, 79, 112, 28, 60, 145, 114, 200, 170, 83, 54, 142, 170, 81, 108, 198]

cp's OEIS Frontend

A123483 Second order Recamán's sequence: a(0) = 0; for n > 0, a(n) = a(n-1) - A005132(n) if that number is positive and not already in the sequence, otherwise a(n-1) + A005132(n).

Table of values

List of values

n	a(n)
0	0
1	1
2	4
3	10
4	8
5	15
6	2
7	22
8	34
9	13
10	24
11	46
12	36
13	59
14	50
15	26
16	18
17	43
18	86
19	148
20	106
21	169
22	128
23	110
24	68
25	51
26	94
27	78
28	122
29	107
30	62
31	48
32	94
33	173
34	60
35	138
36	252
37	175
38	136
39	58
40	20
41	99
42	136
43	56
44	92
45	11
46	46
47	128
48	162
49	79
50	112
51	28
52	60
53	145
54	114
55	200
56	170
57	83
58	54
59	142
60	170
61	81
62	108
63	198

n	a(n)
0	0
1	1
2	4
3	10
4	8
5	15
6	2
7	22
8	34
9	13
10	24
11	46
12	36
13	59
14	50
15	26
16	18
17	43
18	86
19	148
20	106
21	169
22	128
23	110
24	68
25	51
26	94
27	78
28	122
29	107
30	62
31	48
32	94
33	173
34	60
35	138
36	252
37	175
38	136
39	58
40	20
41	99
42	136
43	56
44	92
45	11
46	46
47	128
48	162
49	79
50	112
51	28
52	60
53	145
54	114
55	200
56	170
57	83
58	54
59	142
60	170
61	81
62	108
63	198

n	a(n)
0	0
1	1
2	4
3	10
4	8
5	15
6	2
7	22
8	34
9	13
10	24
11	46
12	36
13	59
14	50
15	26
16	18
17	43
18	86
19	148
20	106
21	169
22	128
23	110
24	68
25	51
26	94
27	78
28	122
29	107
30	62
31	48
32	94
33	173
34	60
35	138
36	252
37	175
38	136
39	58
40	20
41	99
42	136
43	56
44	92
45	11
46	46
47	128
48	162
49	79
50	112
51	28
52	60
53	145
54	114
55	200
56	170
57	83
58	54
59	142
60	170
61	81
62	108
63	198