A362373 - cp's OEIS frontend

A362373 a(0) = 0; for n > 0, if n appears in the sequence then a(n) is the sum of the indices of all previous appearances of n. Otherwise a(n) = a(n-1) - n if nonnegative and not already in the sequence, otherwise a(n) = a(n-1) + n.

n	a(n)
0	0
1	1
2	3
3	2
4	6
5	11
6	4
7	11
8	19
9	10
10	9
11	12
12	11
13	24
14	38
15	23
16	7
17	24
18	42
19	8
20	28
21	49
22	27
23	15
24	30
25	5
26	31
27	22
28	20
29	49
30	24
31	26
32	58
33	25
34	59
35	94
36	130
37	93
38	14
39	53
40	13
41	54
42	18
43	61
44	17
45	62
46	16
47	63
48	111
49	50
50	49
51	100
52	48
53	39
54	41
55	96
56	40
57	97
58	32
59	34
60	94

[0, 1, 3, 2, 6, 11, 4, 11, 19, 10, 9, 12, 11, 24, 38, 23, 7, 24, 42, 8, 28, 49, 27, 15, 30, 5, 31, 22, 20, 49, 24, 26, 58, 25, 59, 94, 130, 93, 14, 53, 13, 54, 18, 61, 17, 62, 16, 63, 111, 50, 49, 100, 48, 39, 41, 96, 40, 97, 32, 34, 94]

cp's OEIS Frontend

A362373 a(0) = 0; for n > 0, if n appears in the sequence then a(n) is the sum of the indices of all previous appearances of n. Otherwise a(n) = a(n-1) - n if nonnegative and not already in the sequence, otherwise a(n) = a(n-1) + n.

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	2
4	6
5	11
6	4
7	11
8	19
9	10
10	9
11	12
12	11
13	24
14	38
15	23
16	7
17	24
18	42
19	8
20	28
21	49
22	27
23	15
24	30
25	5
26	31
27	22
28	20
29	49
30	24
31	26
32	58
33	25
34	59
35	94
36	130
37	93
38	14
39	53
40	13
41	54
42	18
43	61
44	17
45	62
46	16
47	63
48	111
49	50
50	49
51	100
52	48
53	39
54	41
55	96
56	40
57	97
58	32
59	34
60	94

n	a(n)
0	0
1	1
2	3
3	2
4	6
5	11
6	4
7	11
8	19
9	10
10	9
11	12
12	11
13	24
14	38
15	23
16	7
17	24
18	42
19	8
20	28
21	49
22	27
23	15
24	30
25	5
26	31
27	22
28	20
29	49
30	24
31	26
32	58
33	25
34	59
35	94
36	130
37	93
38	14
39	53
40	13
41	54
42	18
43	61
44	17
45	62
46	16
47	63
48	111
49	50
50	49
51	100
52	48
53	39
54	41
55	96
56	40
57	97
58	32
59	34
60	94

n	a(n)
0	0
1	1
2	3
3	2
4	6
5	11
6	4
7	11
8	19
9	10
10	9
11	12
12	11
13	24
14	38
15	23
16	7
17	24
18	42
19	8
20	28
21	49
22	27
23	15
24	30
25	5
26	31
27	22
28	20
29	49
30	24
31	26
32	58
33	25
34	59
35	94
36	130
37	93
38	14
39	53
40	13
41	54
42	18
43	61
44	17
45	62
46	16
47	63
48	111
49	50
50	49
51	100
52	48
53	39
54	41
55	96
56	40
57	97
58	32
59	34
60	94